1068 lines
45 KiB
C++
1068 lines
45 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2022 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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// Leaks when using auto variables
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//---------------------------------------------------------------------------
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#include "checkleakautovar.h"
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#include "astutils.h"
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#include "checkmemoryleak.h" // <- CheckMemoryLeak::memoryLeak
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#include "checknullpointer.h" // <- CheckNullPointer::isPointerDeRef
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#include "mathlib.h"
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#include "settings.h"
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#include "errortypes.h"
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#include "symboldatabase.h"
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#include "token.h"
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#include "tokenize.h"
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#include <array>
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#include <iostream>
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#include <list>
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#include <memory>
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#include <utility>
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#include <vector>
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//---------------------------------------------------------------------------
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// Register this check class (by creating a static instance of it)
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namespace {
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CheckLeakAutoVar instance;
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}
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static const CWE CWE672(672U);
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static const CWE CWE415(415U);
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// Hardcoded allocation types (not from library)
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static const int NEW_ARRAY = -2;
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static const int NEW = -1;
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static const std::array<std::pair<std::string, std::string>, 4> alloc_failed_conds {{{"==", "0"}, {"<", "0"}, {"==", "-1"}, {"<=", "-1"}}};
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static const std::array<std::pair<std::string, std::string>, 4> alloc_success_conds {{{"!=", "0"}, {">", "0"}, {"!=", "-1"}, {">=", "0"}}};
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/**
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* @brief Is variable type some class with automatic deallocation?
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* @param var variable token
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* @return true unless it can be seen there is no automatic deallocation
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*/
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static bool isAutoDealloc(const Variable *var)
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{
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if (var->valueType() && var->valueType()->type != ValueType::Type::RECORD && var->valueType()->type != ValueType::Type::UNKNOWN_TYPE)
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return false;
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// return false if the type is a simple record type without side effects
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// a type that has no side effects (no constructors and no members with constructors)
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/** @todo false negative: check base class for side effects */
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/** @todo false negative: check constructors for side effects */
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if (var->typeScope() && var->typeScope()->numConstructors == 0 &&
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(var->typeScope()->varlist.empty() || var->type()->needInitialization == Type::NeedInitialization::True) &&
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var->type()->derivedFrom.empty())
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return false;
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return true;
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}
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template<std::size_t N>
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static bool isVarTokComparison(const Token * tok, const Token ** vartok,
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const std::array<std::pair<std::string, std::string>, N>& ops)
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{
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for (const auto & op : ops) {
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if (astIsVariableComparison(tok, op.first, op.second, vartok))
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return true;
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}
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return false;
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}
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//---------------------------------------------------------------------------
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void VarInfo::print()
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{
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std::cout << "size=" << alloctype.size() << std::endl;
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for (std::map<int, AllocInfo>::const_iterator it = alloctype.begin(); it != alloctype.end(); ++it) {
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std::string strusage;
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const std::map<int, std::string>::const_iterator use =
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possibleUsage.find(it->first);
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if (use != possibleUsage.end())
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strusage = use->second;
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std::string status;
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switch (it->second.status) {
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case OWNED:
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status = "owned";
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break;
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case DEALLOC:
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status = "dealloc";
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break;
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case ALLOC:
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status = "alloc";
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break;
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case NOALLOC:
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status = "noalloc";
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break;
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case REALLOC:
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status = "realloc";
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break;
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default:
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status = "?";
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break;
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}
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std::cout << "status=" << status << " "
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<< "alloctype='" << it->second.type << "' "
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<< "possibleUsage='" << strusage << "' "
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<< "conditionalAlloc=" << (conditionalAlloc.find(it->first) != conditionalAlloc.end() ? "yes" : "no") << " "
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<< "referenced=" << (referenced.find(it->first) != referenced.end() ? "yes" : "no") << " "
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<< "reallocedFrom=" << it->second.reallocedFromType
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<< std::endl;
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}
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}
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void VarInfo::possibleUsageAll(const std::string &functionName)
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{
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possibleUsage.clear();
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for (std::map<int, AllocInfo>::const_iterator it = alloctype.begin(); it != alloctype.end(); ++it)
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possibleUsage[it->first] = functionName;
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}
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void CheckLeakAutoVar::leakError(const Token *tok, const std::string &varname, int type)
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{
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const CheckMemoryLeak checkmemleak(mTokenizer, mErrorLogger, mSettings);
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if (Library::isresource(type))
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checkmemleak.resourceLeakError(tok, varname);
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else
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checkmemleak.memleakError(tok, varname);
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}
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void CheckLeakAutoVar::mismatchError(const Token *deallocTok, const Token *allocTok, const std::string &varname)
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{
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const CheckMemoryLeak c(mTokenizer, mErrorLogger, mSettings);
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const std::list<const Token *> callstack = { allocTok, deallocTok };
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c.mismatchAllocDealloc(callstack, varname);
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}
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void CheckLeakAutoVar::deallocUseError(const Token *tok, const std::string &varname)
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{
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const CheckMemoryLeak c(mTokenizer, mErrorLogger, mSettings);
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c.deallocuseError(tok, varname);
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}
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void CheckLeakAutoVar::deallocReturnError(const Token *tok, const Token *deallocTok, const std::string &varname)
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{
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const std::list<const Token *> locations = { deallocTok, tok };
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reportError(locations, Severity::error, "deallocret", "$symbol:" + varname + "\nReturning/dereferencing '$symbol' after it is deallocated / released", CWE672, Certainty::normal);
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}
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void CheckLeakAutoVar::configurationInfo(const Token* tok, const std::string &functionName)
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{
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if (mSettings->checkLibrary && mSettings->severity.isEnabled(Severity::information)) {
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reportError(tok,
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Severity::information,
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"checkLibraryUseIgnore",
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"--check-library: Function " + functionName + "() should have <use>/<leak-ignore> configuration");
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}
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}
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void CheckLeakAutoVar::doubleFreeError(const Token *tok, const Token *prevFreeTok, const std::string &varname, int type)
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{
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const std::list<const Token *> locations = { prevFreeTok, tok };
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if (Library::isresource(type))
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reportError(locations, Severity::error, "doubleFree", "$symbol:" + varname + "\nResource handle '$symbol' freed twice.", CWE415, Certainty::normal);
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else
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reportError(locations, Severity::error, "doubleFree", "$symbol:" + varname + "\nMemory pointed to by '$symbol' is freed twice.", CWE415, Certainty::normal);
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}
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void CheckLeakAutoVar::check()
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{
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if (mSettings->clang)
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return;
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const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
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// Local variables that are known to be non-zero.
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const std::set<int> notzero;
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// Check function scopes
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for (const Scope * scope : symbolDatabase->functionScopes) {
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if (scope->hasInlineOrLambdaFunction())
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continue;
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// Empty variable info
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VarInfo varInfo;
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checkScope(scope->bodyStart, &varInfo, notzero, 0);
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}
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}
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static bool isVarUsedInTree(const Token *tok, nonneg int varid)
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{
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if (!tok)
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return false;
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if (tok->varId() == varid)
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return true;
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if (tok->str() == "(" && Token::simpleMatch(tok->astOperand1(), "sizeof"))
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return false;
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return isVarUsedInTree(tok->astOperand1(), varid) || isVarUsedInTree(tok->astOperand2(), varid);
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}
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static bool isPointerReleased(const Token *startToken, const Token *endToken, nonneg int varid)
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{
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for (const Token *tok = startToken; tok && tok != endToken; tok = tok->next()) {
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if (tok->varId() != varid)
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continue;
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if (Token::Match(tok, "%var% . release ( )"))
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return true;
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if (Token::Match(tok, "%var% ="))
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return false;
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}
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return false;
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}
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static bool isLocalVarNoAutoDealloc(const Token *varTok, const bool isCpp)
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{
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// not a local variable nor argument?
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const Variable *var = varTok->variable();
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if (!var)
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return true;
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if (!var->isArgument() && (!var->isLocal() || var->isStatic()))
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return false;
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// Don't check reference variables
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if (var->isReference())
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return false;
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// non-pod variable
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if (isCpp) {
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// Possibly automatically deallocated memory
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if (isAutoDealloc(var) && Token::Match(varTok, "%var% = new"))
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return false;
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if (!var->isPointer() && !var->typeStartToken()->isStandardType())
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return false;
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}
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return true;
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}
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/** checks if nameToken is a name of a function in a function call:
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* func(arg)
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* or
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* func<temp1_arg>(arg)
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* @param nameToken Function name token
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* @return opening parenthesis token or NULL if not a function call
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*/
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static const Token * isFunctionCall(const Token * nameToken)
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{
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if (!nameToken->isStandardType() && nameToken->isName()) {
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nameToken = nameToken->next();
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// check if function is a template
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if (nameToken && nameToken->link() && nameToken->str() == "<") {
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// skip template arguments
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nameToken = nameToken->link()->next();
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}
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// check for '('
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if (nameToken && nameToken->link() && nameToken->str() == "(") {
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// returning opening parenthesis pointer
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return nameToken;
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}
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}
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return nullptr;
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}
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void CheckLeakAutoVar::checkScope(const Token * const startToken,
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VarInfo *varInfo,
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std::set<int> notzero,
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nonneg int recursiveCount)
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{
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#if ASAN
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static const nonneg int recursiveLimit = 300;
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#else
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static const nonneg int recursiveLimit = 1000;
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#endif
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if (++recursiveCount > recursiveLimit) // maximum number of "else if ()"
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throw InternalError(startToken, "Internal limit: CheckLeakAutoVar::checkScope() Maximum recursive count of 1000 reached.", InternalError::LIMIT);
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std::map<int, VarInfo::AllocInfo> &alloctype = varInfo->alloctype;
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std::map<int, std::string> &possibleUsage = varInfo->possibleUsage;
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const std::set<int> conditionalAlloc(varInfo->conditionalAlloc);
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// Parse all tokens
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const Token * const endToken = startToken->link();
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for (const Token *tok = startToken; tok && tok != endToken; tok = tok->next()) {
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if (!tok->scope()->isExecutable()) {
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tok = tok->scope()->bodyEnd;
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if (!tok) // Ticket #6666 (crash upon invalid code)
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break;
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}
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// check each token
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{
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const Token * nextTok = checkTokenInsideExpression(tok, varInfo);
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if (nextTok) {
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tok = nextTok;
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continue;
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}
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}
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// look for end of statement
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if (!Token::Match(tok, "[;{},]") || Token::Match(tok->next(), "[;{},]"))
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continue;
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tok = tok->next();
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if (!tok || tok == endToken)
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break;
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if (Token::Match(tok, "const %type%"))
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tok = tok->tokAt(2);
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while (tok->str() == "(")
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tok = tok->next();
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while (tok->isUnaryOp("*") && tok->astOperand1()->isUnaryOp("&"))
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tok = tok->astOperand1()->astOperand1();
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// parse statement, skip to last member
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const Token *varTok = tok;
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while (Token::Match(varTok, "%name% ::|. %name% !!("))
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varTok = varTok->tokAt(2);
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const Token *ftok = tok;
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if (ftok->str() == "::")
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ftok = ftok->next();
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while (Token::Match(ftok, "%name% :: %name%"))
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ftok = ftok->tokAt(2);
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auto isAssignment = [](const Token* varTok) -> const Token* {
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if (varTok->varId()) {
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const Token* top = varTok;
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while (top->astParent()) {
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top = top->astParent();
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if (!Token::Match(top, "(|*|&|."))
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break;
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}
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if (top->str() == "=" && succeeds(top, varTok))
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return top;
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}
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return nullptr;
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};
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// assignment..
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if (const Token* const tokAssignOp = isAssignment(varTok)) {
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if (Token::simpleMatch(tokAssignOp->astOperand1(), "."))
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continue;
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// taking address of another variable..
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if (Token::Match(tokAssignOp, "= %var% [+;]")) {
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if (varTok->tokAt(2)->varId() != varTok->varId()) {
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// If variable points at allocated memory => error
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leakIfAllocated(varTok, *varInfo);
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// no multivariable checking currently => bail out for rhs variables
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for (const Token *tok2 = varTok; tok2; tok2 = tok2->next()) {
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if (tok2->str() == ";") {
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break;
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}
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if (tok2->varId()) {
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varInfo->erase(tok2->varId());
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}
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}
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}
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}
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// right ast part (after `=` operator)
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const Token* tokRightAstOperand = tokAssignOp->astOperand2();
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while (tokRightAstOperand && tokRightAstOperand->isCast())
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tokRightAstOperand = tokRightAstOperand->astOperand2() ? tokRightAstOperand->astOperand2() : tokRightAstOperand->astOperand1();
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// is variable used in rhs?
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if (isVarUsedInTree(tokRightAstOperand, varTok->varId()))
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continue;
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// Variable has already been allocated => error
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if (conditionalAlloc.find(varTok->varId()) == conditionalAlloc.end())
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leakIfAllocated(varTok, *varInfo);
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varInfo->erase(varTok->varId());
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if (!isLocalVarNoAutoDealloc(varTok, mTokenizer->isCPP()))
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continue;
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// allocation?
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const Token *const fTok = tokRightAstOperand ? tokRightAstOperand->previous() : nullptr;
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if (Token::Match(fTok, "%type% (")) {
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const Library::AllocFunc* f = mSettings->library.getAllocFuncInfo(fTok);
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if (f && f->arg == -1) {
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VarInfo::AllocInfo& varAlloc = alloctype[varTok->varId()];
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varAlloc.type = f->groupId;
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varAlloc.status = VarInfo::ALLOC;
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varAlloc.allocTok = fTok;
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}
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changeAllocStatusIfRealloc(alloctype, fTok, varTok);
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} else if (mTokenizer->isCPP() && Token::Match(varTok->tokAt(2), "new !!(")) {
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const Token* tok2 = varTok->tokAt(2)->astOperand1();
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const bool arrayNew = (tok2 && (tok2->str() == "[" || (tok2->str() == "(" && tok2->astOperand1() && tok2->astOperand1()->str() == "[")));
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VarInfo::AllocInfo& varAlloc = alloctype[varTok->varId()];
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varAlloc.type = arrayNew ? NEW_ARRAY : NEW;
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varAlloc.status = VarInfo::ALLOC;
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varAlloc.allocTok = varTok->tokAt(2);
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}
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// Assigning non-zero value variable. It might be used to
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// track the execution for a later if condition.
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if (Token::Match(varTok->tokAt(2), "%num% ;") && MathLib::toLongNumber(varTok->strAt(2)) != 0)
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notzero.insert(varTok->varId());
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else if (Token::Match(varTok->tokAt(2), "- %type% ;") && varTok->tokAt(3)->isUpperCaseName())
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notzero.insert(varTok->varId());
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else
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notzero.erase(varTok->varId());
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}
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// if/else
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else if (Token::simpleMatch(tok, "if (")) {
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// Parse function calls inside the condition
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const Token * closingParenthesis = tok->linkAt(1);
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for (const Token *innerTok = tok->tokAt(2); innerTok && innerTok != closingParenthesis; innerTok = innerTok->next()) {
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// TODO: replace with checkTokenInsideExpression()
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if (!isLocalVarNoAutoDealloc(innerTok, mTokenizer->isCPP()))
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continue;
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// Check assignments in the if-statement. Skip multiple assignments since we don't track those
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if (Token::Match(innerTok, "%var% =") && innerTok->astParent() == innerTok->next() &&
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!(innerTok->next()->astParent() && innerTok->next()->astParent()->isAssignmentOp())) {
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// allocation?
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// right ast part (after `=` operator)
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const Token* tokRightAstOperand = innerTok->next()->astOperand2();
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while (tokRightAstOperand && tokRightAstOperand->isCast())
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tokRightAstOperand = tokRightAstOperand->astOperand2() ? tokRightAstOperand->astOperand2() : tokRightAstOperand->astOperand1();
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if (tokRightAstOperand && Token::Match(tokRightAstOperand->previous(), "%type% (")) {
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const Library::AllocFunc* f = mSettings->library.getAllocFuncInfo(tokRightAstOperand->previous());
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if (f && f->arg == -1) {
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VarInfo::AllocInfo& varAlloc = alloctype[innerTok->varId()];
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varAlloc.type = f->groupId;
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varAlloc.status = VarInfo::ALLOC;
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varAlloc.allocTok = tokRightAstOperand->previous();
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} else {
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// Fixme: warn about leak
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alloctype.erase(innerTok->varId());
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}
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changeAllocStatusIfRealloc(alloctype, innerTok->tokAt(2), varTok);
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} else if (mTokenizer->isCPP() && Token::Match(innerTok->tokAt(2), "new !!(")) {
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const Token* tok2 = innerTok->tokAt(2)->astOperand1();
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const bool arrayNew = (tok2 && (tok2->str() == "[" || (tok2->str() == "(" && tok2->astOperand1() && tok2->astOperand1()->str() == "[")));
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VarInfo::AllocInfo& varAlloc = alloctype[innerTok->varId()];
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varAlloc.type = arrayNew ? NEW_ARRAY : NEW;
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varAlloc.status = VarInfo::ALLOC;
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varAlloc.allocTok = innerTok->tokAt(2);
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}
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}
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|
|
// check for function call
|
|
const Token * const openingPar = isFunctionCall(innerTok);
|
|
if (openingPar) {
|
|
// innerTok is a function name
|
|
const VarInfo::AllocInfo allocation(0, VarInfo::NOALLOC);
|
|
functionCall(innerTok, openingPar, varInfo, allocation, nullptr);
|
|
innerTok = openingPar->link();
|
|
}
|
|
}
|
|
|
|
if (Token::simpleMatch(closingParenthesis, ") {")) {
|
|
VarInfo varInfo1(*varInfo); // VarInfo for if code
|
|
VarInfo varInfo2(*varInfo); // VarInfo for else code
|
|
|
|
// Skip expressions before commas
|
|
const Token * astOperand2AfterCommas = tok->next()->astOperand2();
|
|
while (Token::simpleMatch(astOperand2AfterCommas, ","))
|
|
astOperand2AfterCommas = astOperand2AfterCommas->astOperand2();
|
|
|
|
// Recursively scan variable comparisons in condition
|
|
visitAstNodes(astOperand2AfterCommas, [&](const Token *tok3) {
|
|
if (!tok3)
|
|
return ChildrenToVisit::none;
|
|
if (tok3->str() == "&&" || tok3->str() == "||") {
|
|
// FIXME: handle && ! || better
|
|
return ChildrenToVisit::op1_and_op2;
|
|
}
|
|
if (tok3->str() == "(" && Token::Match(tok3->astOperand1(), "UNLIKELY|LIKELY")) {
|
|
return ChildrenToVisit::op2;
|
|
} else if (tok3->str() == "(" && tok3->previous()->isName()) {
|
|
const std::vector<const Token *> params = getArguments(tok3->previous());
|
|
for (const Token *par : params) {
|
|
if (!par->isComparisonOp())
|
|
continue;
|
|
const Token *vartok = nullptr;
|
|
if (isVarTokComparison(par, &vartok, alloc_success_conds) ||
|
|
(isVarTokComparison(par, &vartok, alloc_failed_conds))) {
|
|
varInfo1.erase(vartok->varId());
|
|
varInfo2.erase(vartok->varId());
|
|
}
|
|
}
|
|
return ChildrenToVisit::none;
|
|
}
|
|
|
|
const Token *vartok = nullptr;
|
|
if (isVarTokComparison(tok3, &vartok, alloc_success_conds)) {
|
|
varInfo2.reallocToAlloc(vartok->varId());
|
|
varInfo2.erase(vartok->varId());
|
|
if (astIsVariableComparison(tok3, "!=", "0", &vartok) &&
|
|
(notzero.find(vartok->varId()) != notzero.end()))
|
|
varInfo2.clear();
|
|
} else if (isVarTokComparison(tok3, &vartok, alloc_failed_conds)) {
|
|
varInfo1.reallocToAlloc(vartok->varId());
|
|
varInfo1.erase(vartok->varId());
|
|
}
|
|
return ChildrenToVisit::none;
|
|
});
|
|
|
|
checkScope(closingParenthesis->next(), &varInfo1, notzero, recursiveCount);
|
|
closingParenthesis = closingParenthesis->linkAt(1);
|
|
if (Token::simpleMatch(closingParenthesis, "} else {")) {
|
|
checkScope(closingParenthesis->tokAt(2), &varInfo2, notzero, recursiveCount);
|
|
tok = closingParenthesis->linkAt(2)->previous();
|
|
} else {
|
|
tok = closingParenthesis->previous();
|
|
}
|
|
|
|
VarInfo old;
|
|
old.swap(*varInfo);
|
|
|
|
std::map<int, VarInfo::AllocInfo>::const_iterator it;
|
|
|
|
for (it = old.alloctype.begin(); it != old.alloctype.end(); ++it) {
|
|
const int varId = it->first;
|
|
if (old.conditionalAlloc.find(varId) == old.conditionalAlloc.end())
|
|
continue;
|
|
if (varInfo1.alloctype.find(varId) == varInfo1.alloctype.end() ||
|
|
varInfo2.alloctype.find(varId) == varInfo2.alloctype.end()) {
|
|
varInfo1.erase(varId);
|
|
varInfo2.erase(varId);
|
|
}
|
|
}
|
|
|
|
// Conditional allocation in varInfo1
|
|
for (it = varInfo1.alloctype.begin(); it != varInfo1.alloctype.end(); ++it) {
|
|
if (varInfo2.alloctype.find(it->first) == varInfo2.alloctype.end() &&
|
|
old.alloctype.find(it->first) == old.alloctype.end()) {
|
|
varInfo->conditionalAlloc.insert(it->first);
|
|
}
|
|
}
|
|
|
|
// Conditional allocation in varInfo2
|
|
for (it = varInfo2.alloctype.begin(); it != varInfo2.alloctype.end(); ++it) {
|
|
if (varInfo1.alloctype.find(it->first) == varInfo1.alloctype.end() &&
|
|
old.alloctype.find(it->first) == old.alloctype.end()) {
|
|
varInfo->conditionalAlloc.insert(it->first);
|
|
}
|
|
}
|
|
|
|
// Conditional allocation/deallocation
|
|
for (it = varInfo1.alloctype.begin(); it != varInfo1.alloctype.end(); ++it) {
|
|
if (it->second.managed() && conditionalAlloc.find(it->first) != conditionalAlloc.end()) {
|
|
varInfo->conditionalAlloc.erase(it->first);
|
|
varInfo2.erase(it->first);
|
|
}
|
|
}
|
|
for (it = varInfo2.alloctype.begin(); it != varInfo2.alloctype.end(); ++it) {
|
|
if (it->second.managed() && conditionalAlloc.find(it->first) != conditionalAlloc.end()) {
|
|
varInfo->conditionalAlloc.erase(it->first);
|
|
varInfo1.erase(it->first);
|
|
}
|
|
}
|
|
|
|
alloctype.insert(varInfo1.alloctype.begin(), varInfo1.alloctype.end());
|
|
alloctype.insert(varInfo2.alloctype.begin(), varInfo2.alloctype.end());
|
|
|
|
possibleUsage.insert(varInfo1.possibleUsage.begin(), varInfo1.possibleUsage.end());
|
|
possibleUsage.insert(varInfo2.possibleUsage.begin(), varInfo2.possibleUsage.end());
|
|
}
|
|
}
|
|
|
|
// unknown control.. (TODO: handle loops)
|
|
else if ((Token::Match(tok, "%type% (") && Token::simpleMatch(tok->linkAt(1), ") {")) || Token::simpleMatch(tok, "do {")) {
|
|
varInfo->clear();
|
|
break;
|
|
}
|
|
|
|
// return
|
|
else if (tok->str() == "return") {
|
|
ret(tok, *varInfo);
|
|
varInfo->clear();
|
|
}
|
|
|
|
// throw
|
|
else if (mTokenizer->isCPP() && tok->str() == "throw") {
|
|
bool tryFound = false;
|
|
const Scope* scope = tok->scope();
|
|
while (scope && scope->isExecutable()) {
|
|
if (scope->type == Scope::eTry)
|
|
tryFound = true;
|
|
scope = scope->nestedIn;
|
|
}
|
|
// If the execution leaves the function then treat it as return
|
|
if (!tryFound)
|
|
ret(tok, *varInfo);
|
|
varInfo->clear();
|
|
}
|
|
|
|
// delete
|
|
else if (mTokenizer->isCPP() && tok->str() == "delete") {
|
|
const Token * delTok = tok;
|
|
if (Token::simpleMatch(delTok->astOperand1(), "."))
|
|
continue;
|
|
const bool arrayDelete = Token::simpleMatch(tok->next(), "[ ]");
|
|
if (arrayDelete)
|
|
tok = tok->tokAt(3);
|
|
else
|
|
tok = tok->next();
|
|
if (tok->str() == "(")
|
|
tok = tok->next();
|
|
while (Token::Match(tok, "%name% ::|."))
|
|
tok = tok->tokAt(2);
|
|
const bool isnull = tok->hasKnownIntValue() && tok->values().front().intvalue == 0;
|
|
if (!isnull && tok->varId() && tok->strAt(1) != "[") {
|
|
const VarInfo::AllocInfo allocation(arrayDelete ? NEW_ARRAY : NEW, VarInfo::DEALLOC, delTok);
|
|
changeAllocStatus(varInfo, allocation, tok, tok);
|
|
}
|
|
}
|
|
|
|
// Function call..
|
|
else if (const Token* openingPar = isFunctionCall(ftok)) {
|
|
const Library::AllocFunc* af = mSettings->library.getDeallocFuncInfo(ftok);
|
|
VarInfo::AllocInfo allocation(af ? af->groupId : 0, VarInfo::DEALLOC, ftok);
|
|
if (allocation.type == 0)
|
|
allocation.status = VarInfo::NOALLOC;
|
|
if (Token::simpleMatch(ftok->astParent(), "(") && Token::simpleMatch(ftok->astParent()->astOperand2(), "."))
|
|
continue;
|
|
functionCall(ftok, openingPar, varInfo, allocation, af);
|
|
|
|
tok = ftok->next()->link();
|
|
|
|
// Handle scopes that might be noreturn
|
|
if (allocation.status == VarInfo::NOALLOC && Token::simpleMatch(tok, ") ; }")) {
|
|
if (ftok->isKeyword())
|
|
continue;
|
|
const std::string functionName(mSettings->library.getFunctionName(ftok));
|
|
bool unknown = false;
|
|
if (mTokenizer->isScopeNoReturn(tok->tokAt(2), &unknown)) {
|
|
if (!unknown)
|
|
varInfo->clear();
|
|
else if (!mSettings->library.isLeakIgnore(functionName) && !mSettings->library.isUse(functionName))
|
|
varInfo->possibleUsageAll(functionName);
|
|
}
|
|
}
|
|
|
|
continue;
|
|
}
|
|
|
|
// goto => weird execution path
|
|
else if (tok->str() == "goto") {
|
|
varInfo->clear();
|
|
}
|
|
|
|
// continue/break
|
|
else if (Token::Match(tok, "continue|break ;")) {
|
|
varInfo->clear();
|
|
}
|
|
|
|
// Check smart pointer
|
|
else if (Token::Match(ftok, "%name% <") && mSettings->library.isSmartPointer(tok)) {
|
|
const Token * typeEndTok = ftok->linkAt(1);
|
|
if (!Token::Match(typeEndTok, "> %var% {|( %var% ,|)|}"))
|
|
continue;
|
|
|
|
tok = typeEndTok->linkAt(2);
|
|
|
|
const int varid = typeEndTok->next()->varId();
|
|
if (isPointerReleased(typeEndTok->tokAt(2), endToken, varid))
|
|
continue;
|
|
|
|
bool arrayDelete = false;
|
|
if (Token::findsimplematch(ftok->next(), "[ ]", typeEndTok))
|
|
arrayDelete = true;
|
|
|
|
// Check deleter
|
|
const Token * deleterToken = nullptr;
|
|
const Token * endDeleterToken = nullptr;
|
|
const Library::AllocFunc* af = nullptr;
|
|
if (Token::Match(ftok, "unique_ptr < %type% ,")) {
|
|
deleterToken = ftok->tokAt(4);
|
|
endDeleterToken = typeEndTok;
|
|
} else if (Token::Match(typeEndTok, "> %var% {|( %var% ,")) {
|
|
deleterToken = typeEndTok->tokAt(5);
|
|
endDeleterToken = typeEndTok->linkAt(2);
|
|
}
|
|
if (deleterToken) {
|
|
// Skip the decaying plus in expressions like +[](T*){}
|
|
if (deleterToken->str() == "+") {
|
|
deleterToken = deleterToken->next();
|
|
}
|
|
// Check if its a pointer to a function
|
|
const Token * dtok = Token::findmatch(deleterToken, "& %name%", endDeleterToken);
|
|
if (dtok) {
|
|
af = mSettings->library.getDeallocFuncInfo(dtok->tokAt(1));
|
|
} else {
|
|
const Token * tscopeStart = nullptr;
|
|
const Token * tscopeEnd = nullptr;
|
|
// If the deleter is a lambda, check if it calls the dealloc function
|
|
if (deleterToken->str() == "[" &&
|
|
Token::simpleMatch(deleterToken->link(), "] (") &&
|
|
// TODO: Check for mutable keyword
|
|
Token::simpleMatch(deleterToken->link()->linkAt(1), ") {")) {
|
|
tscopeStart = deleterToken->link()->linkAt(1)->tokAt(1);
|
|
tscopeEnd = tscopeStart->link();
|
|
// If the deleter is a class, check if class calls the dealloc function
|
|
} else if ((dtok = Token::findmatch(deleterToken, "%type%", endDeleterToken)) && dtok->type()) {
|
|
const Scope * tscope = dtok->type()->classScope;
|
|
if (tscope) {
|
|
tscopeStart = tscope->bodyStart;
|
|
tscopeEnd = tscope->bodyEnd;
|
|
}
|
|
}
|
|
|
|
if (tscopeStart && tscopeEnd) {
|
|
for (const Token *tok2 = tscopeStart; tok2 != tscopeEnd; tok2 = tok2->next()) {
|
|
af = mSettings->library.getDeallocFuncInfo(tok2);
|
|
if (af)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
const Token * vtok = typeEndTok->tokAt(3);
|
|
const VarInfo::AllocInfo allocation(af ? af->groupId : (arrayDelete ? NEW_ARRAY : NEW), VarInfo::OWNED, ftok);
|
|
changeAllocStatus(varInfo, allocation, vtok, vtok);
|
|
}
|
|
}
|
|
ret(endToken, *varInfo, true);
|
|
}
|
|
|
|
|
|
const Token * CheckLeakAutoVar::checkTokenInsideExpression(const Token * const tok, VarInfo *varInfo)
|
|
{
|
|
// Deallocation and then dereferencing pointer..
|
|
if (tok->varId() > 0) {
|
|
// TODO : Write a separate checker for this that uses valueFlowForward.
|
|
const std::map<int, VarInfo::AllocInfo>::const_iterator var = varInfo->alloctype.find(tok->varId());
|
|
if (var != varInfo->alloctype.end()) {
|
|
bool unknown = false;
|
|
if (var->second.status == VarInfo::DEALLOC && CheckNullPointer::isPointerDeRef(tok, unknown, mSettings) && !unknown) {
|
|
deallocUseError(tok, tok->str());
|
|
} else if (Token::simpleMatch(tok->tokAt(-2), "= &")) {
|
|
varInfo->erase(tok->varId());
|
|
} else {
|
|
// check if tok is assigned into another variable
|
|
const Token *rhs = tok;
|
|
while (rhs->astParent()) {
|
|
if (rhs->astParent()->str() == "=")
|
|
break;
|
|
rhs = rhs->astParent();
|
|
}
|
|
while (rhs->isCast()) {
|
|
rhs = rhs->astOperand2() ? rhs->astOperand2() : rhs->astOperand1();
|
|
}
|
|
if (rhs->varId() == tok->varId()) {
|
|
// simple assignment
|
|
varInfo->erase(tok->varId());
|
|
} else if (rhs->str() == "(" && !mSettings->library.returnValue(rhs->astOperand1()).empty()) {
|
|
// #9298, assignment through return value of a function
|
|
const std::string &returnValue = mSettings->library.returnValue(rhs->astOperand1());
|
|
if (returnValue.compare(0, 3, "arg") == 0) {
|
|
int argn;
|
|
const Token *func = getTokenArgumentFunction(tok, argn);
|
|
if (func) {
|
|
const std::string arg = "arg" + std::to_string(argn + 1);
|
|
if (returnValue == arg) {
|
|
varInfo->erase(tok->varId());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} else if (Token::Match(tok->previous(), "& %name% = %var% ;")) {
|
|
varInfo->referenced.insert(tok->tokAt(2)->varId());
|
|
}
|
|
}
|
|
|
|
// check for function call
|
|
const Token * const openingPar = isFunctionCall(tok);
|
|
if (openingPar) {
|
|
const Library::AllocFunc* allocFunc = mSettings->library.getDeallocFuncInfo(tok);
|
|
VarInfo::AllocInfo alloc(allocFunc ? allocFunc->groupId : 0, VarInfo::DEALLOC, tok);
|
|
if (alloc.type == 0)
|
|
alloc.status = VarInfo::NOALLOC;
|
|
functionCall(tok, openingPar, varInfo, alloc, nullptr);
|
|
const std::string &returnValue = mSettings->library.returnValue(tok);
|
|
if (returnValue.compare(0, 3, "arg") == 0)
|
|
// the function returns one of its argument, we need to process a potential assignment
|
|
return openingPar;
|
|
return isCPPCast(tok->astParent()) ? openingPar : openingPar->link();
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
|
|
void CheckLeakAutoVar::changeAllocStatusIfRealloc(std::map<int, VarInfo::AllocInfo> &alloctype, const Token *fTok, const Token *retTok)
|
|
{
|
|
const Library::AllocFunc* f = mSettings->library.getReallocFuncInfo(fTok);
|
|
if (f && f->arg == -1 && f->reallocArg > 0 && f->reallocArg <= numberOfArguments(fTok)) {
|
|
const Token* argTok = getArguments(fTok).at(f->reallocArg - 1);
|
|
if (alloctype.find(argTok->varId()) != alloctype.end()) {
|
|
VarInfo::AllocInfo& argAlloc = alloctype[argTok->varId()];
|
|
if (argAlloc.type != 0 && argAlloc.type != f->groupId)
|
|
mismatchError(fTok, argAlloc.allocTok, argTok->str());
|
|
argAlloc.status = VarInfo::REALLOC;
|
|
argAlloc.allocTok = fTok;
|
|
}
|
|
VarInfo::AllocInfo& retAlloc = alloctype[retTok->varId()];
|
|
retAlloc.type = f->groupId;
|
|
retAlloc.status = VarInfo::ALLOC;
|
|
retAlloc.allocTok = fTok;
|
|
retAlloc.reallocedFromType = argTok->varId();
|
|
}
|
|
}
|
|
|
|
|
|
void CheckLeakAutoVar::changeAllocStatus(VarInfo *varInfo, const VarInfo::AllocInfo& allocation, const Token* tok, const Token* arg)
|
|
{
|
|
std::map<int, VarInfo::AllocInfo> &alloctype = varInfo->alloctype;
|
|
const std::map<int, VarInfo::AllocInfo>::iterator var = alloctype.find(arg->varId());
|
|
if (var != alloctype.end()) {
|
|
if (allocation.status == VarInfo::NOALLOC) {
|
|
// possible usage
|
|
varInfo->possibleUsage[arg->varId()] = tok->str();
|
|
if (var->second.status == VarInfo::DEALLOC && arg->previous()->str() == "&")
|
|
varInfo->erase(arg->varId());
|
|
} else if (var->second.managed()) {
|
|
doubleFreeError(tok, var->second.allocTok, arg->str(), allocation.type);
|
|
var->second.status = allocation.status;
|
|
} else if (var->second.type != allocation.type && var->second.type != 0) {
|
|
// mismatching allocation and deallocation
|
|
mismatchError(tok, var->second.allocTok, arg->str());
|
|
varInfo->erase(arg->varId());
|
|
} else {
|
|
// deallocation
|
|
var->second.status = allocation.status;
|
|
var->second.type = allocation.type;
|
|
var->second.allocTok = allocation.allocTok;
|
|
}
|
|
} else if (allocation.status != VarInfo::NOALLOC && allocation.status != VarInfo::OWNED && !Token::simpleMatch(tok->astTop(), "return")) {
|
|
alloctype[arg->varId()].status = VarInfo::DEALLOC;
|
|
alloctype[arg->varId()].allocTok = tok;
|
|
}
|
|
}
|
|
|
|
void CheckLeakAutoVar::functionCall(const Token *tokName, const Token *tokOpeningPar, VarInfo *varInfo, const VarInfo::AllocInfo& allocation, const Library::AllocFunc* af)
|
|
{
|
|
// Ignore function call?
|
|
if (mSettings->library.isLeakIgnore(mSettings->library.getFunctionName(tokName)))
|
|
return;
|
|
if (mSettings->library.getReallocFuncInfo(tokName))
|
|
return;
|
|
|
|
const Token * const tokFirstArg = tokOpeningPar->next();
|
|
if (!tokFirstArg || tokFirstArg->str() == ")") {
|
|
// no arguments
|
|
return;
|
|
}
|
|
|
|
int argNr = 1;
|
|
for (const Token *funcArg = tokFirstArg; funcArg; funcArg = funcArg->nextArgument()) {
|
|
const Token* arg = funcArg;
|
|
if (mTokenizer->isCPP()) {
|
|
int tokAdvance = 0;
|
|
if (arg->str() == "new")
|
|
tokAdvance = 1;
|
|
else if (Token::simpleMatch(arg, "* new"))
|
|
tokAdvance = 2;
|
|
if (tokAdvance > 0) {
|
|
arg = arg->tokAt(tokAdvance);
|
|
if (Token::simpleMatch(arg, "( std :: nothrow )"))
|
|
arg = arg->tokAt(5);
|
|
}
|
|
}
|
|
|
|
// Skip casts
|
|
while (arg && arg->isCast())
|
|
arg = arg->astOperand2() ? arg->astOperand2() : arg->astOperand1();
|
|
const Token * const argTypeStartTok = arg;
|
|
|
|
while (Token::Match(arg, "%name% .|:: %name%"))
|
|
arg = arg->tokAt(2);
|
|
|
|
if (Token::Match(arg, "%var% [-,)] !!.") || Token::Match(arg, "& %var%")) {
|
|
// goto variable
|
|
if (arg->str() == "&")
|
|
arg = arg->next();
|
|
|
|
const bool isnull = arg->hasKnownIntValue() && arg->values().front().intvalue == 0;
|
|
|
|
// Is variable allocated?
|
|
if (!isnull && (!af || af->arg == argNr)) {
|
|
const Library::AllocFunc* deallocFunc = mSettings->library.getDeallocFuncInfo(tokName);
|
|
VarInfo::AllocInfo dealloc(deallocFunc ? deallocFunc->groupId : 0, VarInfo::DEALLOC, tokName);
|
|
if (dealloc.type == 0)
|
|
changeAllocStatus(varInfo, allocation, tokName, arg);
|
|
else
|
|
changeAllocStatus(varInfo, dealloc, tokName, arg);
|
|
}
|
|
}
|
|
// Check smart pointer
|
|
else if (Token::Match(arg, "%name% < %type%") && mSettings->library.isSmartPointer(argTypeStartTok)) {
|
|
const Token * typeEndTok = arg->linkAt(1);
|
|
const Token * allocTok = nullptr;
|
|
if (!Token::Match(typeEndTok, "> {|( %var% ,|)|}"))
|
|
continue;
|
|
|
|
bool arrayDelete = false;
|
|
if (Token::findsimplematch(arg->next(), "[ ]", typeEndTok))
|
|
arrayDelete = true;
|
|
|
|
// Check deleter
|
|
const Token * deleterToken = nullptr;
|
|
const Token * endDeleterToken = nullptr;
|
|
const Library::AllocFunc* sp_af = nullptr;
|
|
if (Token::Match(arg, "unique_ptr < %type% ,")) {
|
|
deleterToken = arg->tokAt(4);
|
|
endDeleterToken = typeEndTok;
|
|
} else if (Token::Match(typeEndTok, "> {|( %var% ,")) {
|
|
deleterToken = typeEndTok->tokAt(4);
|
|
endDeleterToken = typeEndTok->linkAt(1);
|
|
}
|
|
if (deleterToken) {
|
|
// Check if its a pointer to a function
|
|
const Token * dtok = Token::findmatch(deleterToken, "& %name%", endDeleterToken);
|
|
if (dtok) {
|
|
sp_af = mSettings->library.getDeallocFuncInfo(dtok->tokAt(1));
|
|
} else {
|
|
// If the deleter is a class, check if class calls the dealloc function
|
|
dtok = Token::findmatch(deleterToken, "%type%", endDeleterToken);
|
|
if (dtok && dtok->type()) {
|
|
const Scope * tscope = dtok->type()->classScope;
|
|
for (const Token *tok2 = tscope->bodyStart; tok2 != tscope->bodyEnd; tok2 = tok2->next()) {
|
|
sp_af = mSettings->library.getDeallocFuncInfo(tok2);
|
|
if (sp_af) {
|
|
allocTok = tok2;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
const Token * vtok = typeEndTok->tokAt(2);
|
|
const VarInfo::AllocInfo sp_allocation(sp_af ? sp_af->groupId : (arrayDelete ? NEW_ARRAY : NEW), VarInfo::OWNED, allocTok);
|
|
changeAllocStatus(varInfo, sp_allocation, vtok, vtok);
|
|
} else {
|
|
checkTokenInsideExpression(arg, varInfo);
|
|
}
|
|
// TODO: check each token in argument expression (could contain multiple variables)
|
|
argNr++;
|
|
}
|
|
}
|
|
|
|
|
|
void CheckLeakAutoVar::leakIfAllocated(const Token *vartok,
|
|
const VarInfo &varInfo)
|
|
{
|
|
const std::map<int, VarInfo::AllocInfo> &alloctype = varInfo.alloctype;
|
|
const std::map<int, std::string> &possibleUsage = varInfo.possibleUsage;
|
|
|
|
const std::map<int, VarInfo::AllocInfo>::const_iterator var = alloctype.find(vartok->varId());
|
|
if (var != alloctype.end() && var->second.status == VarInfo::ALLOC) {
|
|
const std::map<int, std::string>::const_iterator use = possibleUsage.find(vartok->varId());
|
|
if (use == possibleUsage.end()) {
|
|
leakError(vartok, vartok->str(), var->second.type);
|
|
} else {
|
|
configurationInfo(vartok, use->second);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckLeakAutoVar::ret(const Token *tok, VarInfo &varInfo, const bool isEndOfScope)
|
|
{
|
|
const std::map<int, VarInfo::AllocInfo> &alloctype = varInfo.alloctype;
|
|
const std::map<int, std::string> &possibleUsage = varInfo.possibleUsage;
|
|
std::vector<int> toRemove;
|
|
|
|
const SymbolDatabase *symbolDatabase = mTokenizer->getSymbolDatabase();
|
|
for (std::map<int, VarInfo::AllocInfo>::const_iterator it = alloctype.begin(); it != alloctype.end(); ++it) {
|
|
// don't warn if variable is conditionally allocated, unless it leaves the scope
|
|
if (!isEndOfScope && !it->second.managed() && varInfo.conditionalAlloc.find(it->first) != varInfo.conditionalAlloc.end())
|
|
continue;
|
|
|
|
// don't warn if there is a reference of the variable
|
|
if (varInfo.referenced.find(it->first) != varInfo.referenced.end())
|
|
continue;
|
|
|
|
const int varid = it->first;
|
|
const Variable *var = symbolDatabase->getVariableFromVarId(varid);
|
|
if (var) {
|
|
// don't warn if we leave an inner scope
|
|
if (isEndOfScope && var->scope() && tok != var->scope()->bodyEnd)
|
|
continue;
|
|
bool used = false;
|
|
for (const Token *tok2 = tok; tok2; tok2 = tok2->next()) {
|
|
if (tok2->str() == ";")
|
|
break;
|
|
if (!Token::Match(tok2, "return|(|{|,"))
|
|
continue;
|
|
|
|
const Token* tok3 = tok2->next();
|
|
while (tok3 && tok3->isCast() && tok3->valueType() &&
|
|
(tok3->valueType()->pointer ||
|
|
(tok3->valueType()->typeSize(*mSettings) == 0) ||
|
|
(tok3->valueType()->typeSize(*mSettings) >= mSettings->sizeof_pointer)))
|
|
tok3 = tok3->astOperand2() ? tok3->astOperand2() : tok3->astOperand1();
|
|
if (tok3 && tok3->varId() == varid)
|
|
tok2 = tok3->next();
|
|
else if (Token::Match(tok3, "& %varid% . %name%", varid))
|
|
tok2 = tok3->tokAt(4);
|
|
else
|
|
continue;
|
|
if (Token::Match(tok2, "[});,+]")) {
|
|
used = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// return deallocated pointer
|
|
if (used && it->second.status == VarInfo::DEALLOC)
|
|
deallocReturnError(tok, it->second.allocTok, var->name());
|
|
|
|
else if (!used && !it->second.managed()) {
|
|
const std::map<int, std::string>::const_iterator use = possibleUsage.find(varid);
|
|
if (use == possibleUsage.end()) {
|
|
leakError(tok, var->name(), it->second.type);
|
|
} else {
|
|
configurationInfo(tok, use->second);
|
|
}
|
|
}
|
|
toRemove.push_back(varid);
|
|
}
|
|
}
|
|
for (const int varId : toRemove)
|
|
varInfo.erase(varId);
|
|
}
|