Fix #12289 FN (regression): memory leak not shown when strcpy is used (#5809)

Author: chrchr-github

lib/checkleakautovar.cpp

@@ -841,7 +841,7 @@ const Token * CheckLeakAutoVar::checkTokenInsideExpression(const Token * const t
                 if (rhs->varId() == tok->varId()) {
                     // simple assignment
                     varInfo.erase(tok->varId());
-                } else if (rhs->str() == "(" && !mSettings->library.returnValue(rhs->astOperand1()).empty()) {
+                } else if (rhs->astParent() && 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 (startsWith(returnValue, "arg")) {

test/testleakautovar.cpp

@@ -2999,6 +2999,7 @@ class TestLeakAutoVarStrcpy : public TestFixture {
         TEST_CASE(returnedValue); // #9298
         TEST_CASE(deallocuse2);
         TEST_CASE(fclose_false_positive); // #9575
+        TEST_CASE(strcpy_false_negative);
     }
 
     void returnedValue() { // #9298
@@ -3037,6 +3038,13 @@ class TestLeakAutoVarStrcpy : public TestFixture {
         ASSERT_EQUALS("", errout.str());
     }
 
+    void strcpy_false_negative() { // #12289
+        check("void f() {\n"
+              "    char* buf = new char[12];\n"
+              "    strcpy(buf, \"123\");\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: buf\n", errout.str());
+    }
 };
 
 REGISTER_TEST(TestLeakAutoVarStrcpy)