Fixed #2821 (New Check : bool pointer null truth assignment)

lib/checkother.cpp

@@ -3835,3 +3835,27 @@ void CheckOther::duplicateBreakError(const Token *tok)
                 "Consecutive break or continue statements are unnecessary\n"
                 "The second of the two statements can never be executed, and so should be removed\n");
 }
+
+
+void CheckOther::checkAssignBoolToPointer()
+{
+    for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
+    {
+        if (Token::Match(tok, "[;{}] %var% = %bool% ;"))
+        {
+            const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
+
+            const Variable *var1(symbolDatabase->getVariableFromVarId(tok->next()->varId()));
+
+            // Is variable a pointer?
+            if (var1 && var1->nameToken()->strAt(-1) == "*")
+                assignBoolToPointerError(tok->next());
+        }
+    }
+}
+
+void CheckOther::assignBoolToPointerError(const Token *tok)
+{
+    reportError(tok, Severity::error, "assignBoolToPointer",
+                "Assigning bool value to pointer (converting bool value to address)");
+}

lib/checkother.h

@@ -101,6 +101,8 @@ public:
         checkOther.checkComparisonOfBoolWithInt();
         checkOther.checkSwitchCaseFallThrough();
         checkOther.checkAlwaysTrueOrFalseStringCompare();
+        
+        checkOther.checkAssignBoolToPointer();
     }
 
     /** @brief Clarify calculation for ".. a * b ? .." */
@@ -232,6 +234,9 @@ public:
     bool isRecordTypeWithoutSideEffects(const Token *tok);
 
 
+    /** @brief assigning bool to pointer */
+    void checkAssignBoolToPointer();
+
     // Error messages..
     void cstyleCastError(const Token *tok);
     void dangerousUsageStrtolError(const Token *tok);
@@ -266,12 +271,14 @@ public:
     void duplicateExpressionError(const Token *tok1, const Token *tok2, const std::string &op);
     void alwaysTrueFalseStringCompare(const Token *tok, const std::string& str1, const std::string& str2);
     void duplicateBreakError(const Token *tok);
+    void assignBoolToPointerError(const Token *tok);
 
     void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings)
     {
         CheckOther c(0, settings, errorLogger);
 
         // error
+        c.assignBoolToPointerError(0);
         c.sprintfOverlappingDataError(0, "varname");
         c.udivError(0);
         c.zerodivError(0);
@@ -328,6 +335,7 @@ public:
         return "Other checks\n"
 
                // error
+               "* Assigning bool value to pointer (converting bool value to address)"
                "* [[OverlappingData|bad usage of the function 'sprintf' (overlapping data)]]\n"
                "* division with zero\n"
                "* using fflush() on an input stream\n"

test/testother.cpp

@@ -35,6 +35,8 @@ private:
 
     void run()
     {
+        TEST_CASE(assignBoolToPointer);
+        
         TEST_CASE(zeroDiv1);
         TEST_CASE(zeroDiv2);
         TEST_CASE(zeroDiv3);
@@ -171,6 +173,7 @@ private:
         checkOther.checkIncrementBoolean();
         checkOther.checkComparisonOfBoolWithInt();
         checkOther.checkDuplicateBreak();
+        checkOther.checkAssignBoolToPointer();
     }
 
     class SimpleSuppressor: public ErrorLogger
@@ -229,6 +232,15 @@ private:
     }
 
 
+    void assignBoolToPointer()
+    {
+        check("void foo(bool *p) {\n"
+              "    p = false;\n"
+              "}");
+        ASSERT_EQUALS("[test.cpp:2]: (error) Assigning bool value to pointer (converting bool value to address)\n", errout.str());
+    }
+
+
     void zeroDiv1()
     {
         check("void foo()\n"