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Refactorizations in CheckBufferOverrun: 

- Improved performance of CheckBufferOverrun::checkScope()
- Made some patterns less restrictive
This commit is contained in:
PKEuS 2016-05-25 11:50:34 +02:00
parent cda246da75
commit 728d4242dc
1 changed files with 19 additions and 17 deletions
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36
lib/checkbufferoverrun.cpp
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@ -514,7 +514,7 @@ void CheckBufferOverrun::checkFunctionCall(const Token *tok, const ArrayInfo &ar
return; return;
// Prevent recursion // Prevent recursion
for (std::list<const Token*>::const_iterator it = callstack.begin(); it != callstack.end(); ++it) { for (std::list<const Token*>::const_iterator it = callstack.cbegin(); it != callstack.cend(); ++it) {
// Same function name => bail out // Same function name => bail out
if (tok->str() == (*it)->str()) if (tok->str() == (*it)->str())
return; return;
@ -679,12 +679,14 @@ void CheckBufferOverrun::checkScope(const Token *tok, const std::vector<std::str
} }
// memset, memcmp, memcpy, strncpy, fgets.. // memset, memcmp, memcpy, strncpy, fgets..
if (declarationId == 0 && size > 0) { if (declarationId == 0 && size > 0 && Token::Match(tok, "%name% ( !!)")) {
std::list<const Token *> callstack; std::list<const Token *> callstack;
callstack.push_back(tok); callstack.push_back(tok);
if (Token::Match(tok, ("%name% ( " + varnames + " ,").c_str())) const Token* tok2 = tok->tokAt(2);
if (Token::Match(tok2, (varnames + " ,").c_str()))
checkFunctionParameter(*tok, 1, arrayInfo, callstack); checkFunctionParameter(*tok, 1, arrayInfo, callstack);
if (Token::Match(tok, ("%name% ( %name% , " + varnames + " ,").c_str())) tok2 = tok2->nextArgument();
if (Token::Match(tok2, (varnames + " ,").c_str()))
checkFunctionParameter(*tok, 2, arrayInfo, callstack); checkFunctionParameter(*tok, 2, arrayInfo, callstack);
} }
@ -911,10 +913,10 @@ void CheckBufferOverrun::checkScope(const Token *tok, const ArrayInfo &arrayInfo
} }
} }
else if (!tok->scope()->isExecutable()) // No executable code outside of executable scope - continue to increase performance if (!tok->scope()->isExecutable()) // No executable code outside of executable scope - continue to increase performance
continue; continue;
else if (Token::Match(tok, "%name% (")) { else if (tok->next() && tok->next()->link() && Token::Match(tok, "%name% (")) {
// Check function call.. // Check function call..
checkFunctionCall(tok, arrayInfo, std::list<const Token*>()); checkFunctionCall(tok, arrayInfo, std::list<const Token*>());
@ -966,16 +968,16 @@ void CheckBufferOverrun::checkScope(const Token *tok, const ArrayInfo &arrayInfo
} }
// Writing data into array.. // Writing data into array..
if (total_size > 0 && Token::Match(tok, "strcpy|strcat ( %varid% , %str% )", declarationId)) {
const std::size_t len = Token::getStrLength(tok->tokAt(4));
if (len >= total_size) {
bufferOverrunError(tok, arrayInfo.varname());
continue;
}
}
// Detect few strcat() calls
if (total_size > 0) { if (total_size > 0) {
if (Token::Match(tok, "strcpy ( %varid% , %str% )", declarationId)) {
const std::size_t len = Token::getStrLength(tok->tokAt(4));
if (len >= total_size) {
bufferOverrunError(tok, arrayInfo.varname());
continue;
}
}
// Detect few strcat() calls
MathLib::biguint charactersAppend = 0; MathLib::biguint charactersAppend = 0;
const Token *tok2 = tok; const Token *tok2 = tok;
@ -1191,11 +1193,11 @@ void CheckBufferOverrun::checkGlobalAndLocalVariable()
if (size < 0) { if (size < 0) {
negativeMemoryAllocationSizeError(tok->next()->next()); negativeMemoryAllocationSizeError(tok->next()->next());
} }
} else if (_tokenizer->isCPP() && Token::Match(tok, "[*;{}] %var% = new %type% ( %num%|%name% )")) { } else if (_tokenizer->isCPP() && Token::Match(tok, "[*;{}] %var% = new %type% (|;")) {
size = 1; size = 1;
type = tok->strAt(4); type = tok->strAt(4);
var = tok->next()->variable(); var = tok->next()->variable();
nextTok = 8; nextTok = 7;
} else if (Token::Match(tok, "[*;{}] %var% = malloc|alloca ( %num% ) ;")) { } else if (Token::Match(tok, "[*;{}] %var% = malloc|alloca ( %num% ) ;")) {
size = MathLib::toLongNumber(tok->strAt(5)); size = MathLib::toLongNumber(tok->strAt(5));
type = "char"; // minimum type, typesize=1 type = "char"; // minimum type, typesize=1