Fix #11043 FN: memleak posix getline / #12297 FP: memleak (#6103)

Author: chrchr-github

lib/checkleakautovar.cpp

@@ -987,10 +987,11 @@ void CheckLeakAutoVar::functionCall(const Token *tokName, const Token *tokOpenin
 
         if (Token::Match(arg, "%var% [-,)] !!.") || Token::Match(arg, "& %var% !!.")) {
             // goto variable
-            if (arg->str() == "&")
+            const bool isAddressOf = arg->str() == "&";
+            if (isAddressOf)
                 arg = arg->next();
 
-            const bool isnull = arg->hasKnownIntValue() && arg->values().front().intvalue == 0;
+            const bool isnull = !isAddressOf && (arg->hasKnownIntValue() && arg->values().front().intvalue == 0);
 
             // Is variable allocated?
             if (!isnull && (!af || af->arg == argNr)) {
@@ -1000,7 +1001,9 @@ void CheckLeakAutoVar::functionCall(const Token *tokName, const Token *tokOpenin
                     if (mSettings->library.getDeallocFuncInfo(tokName)) {
                         changeAllocStatus(varInfo, dealloc.type == 0 ? allocation : dealloc, tokName, arg);
                     }
-                    if (allocFunc->arg == argNr && !(arg->variable() && arg->variable()->isArgument() && arg->valueType() && arg->valueType()->pointer > 1)) {
+                    if (allocFunc->arg == argNr &&
+                        !(arg->variable() && arg->variable()->isArgument() && arg->valueType() && arg->valueType()->pointer > 1) &&
+                        (isAddressOf || (arg->valueType() && arg->valueType()->pointer == 2))) {
                         leakIfAllocated(arg, varInfo);
                         VarInfo::AllocInfo& varAlloc = varInfo.alloctype[arg->varId()];
                         varAlloc.type = allocFunc->groupId;

test/cfg/posix.c

@@ -1035,12 +1035,13 @@ void nullPointer_pthread_create() // #12396
     pthread_create(&thread, NULL, (void* (*)(void*))f_returns_NULL, NULL);
 }
 
-void memleak_getaddrinfo()
+void memleak_getaddrinfo() // #6994
 {
-    //TODO: nothing to report yet, see http://sourceforge.net/p/cppcheck/discussion/general/thread/d9737d5d/
     struct addrinfo * res=NULL;
     getaddrinfo("node", NULL, NULL, &res);
     freeaddrinfo(res);
+    getaddrinfo("node", NULL, NULL, &res);
+    // cppcheck-suppress memleak
 }
 
 void memleak_mmap(int fd)
@@ -1058,6 +1059,17 @@ void * memleak_mmap2() // #8327
     return NULL;
 }
 
+void memleak_getline() { // #11043
+    char *line = NULL;
+    size_t size = 0;
+    getline(&line, &size, stdin);
+    // cppcheck-suppress memleak
+    line = NULL;
+    getline(&line, &size, stdin);
+    // cppcheck-suppress memleak
+    line = NULL;
+}
+
 void * identicalCondition_mmap(int fd, size_t size) // #9940
 {
     void* buffer = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

test/cfg/windows.cpp

@@ -572,7 +572,7 @@ void memleak_AllocateAndInitializeSid()
     PSID pEveryoneSID = NULL;
     SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
     AllocateAndInitializeSid(&SIDAuthWorld, 1, SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0, &pEveryoneSID);
-    // TODO: enable when #6994 is implemented cppcheck-suppress memleak
+    // cppcheck-suppress memleak
 }
 
 void memleak_HeapAlloc()

test/testleakautovar.cpp

@@ -28,9 +28,6 @@
 #include <string>
 #include <vector>
 
-class TestLeakAutoVarStrcpy;
-class TestLeakAutoVarWindows;
-
 class TestLeakAutoVar : public TestFixture {
 public:
     TestLeakAutoVar() : TestFixture("TestLeakAutoVar") {}
@@ -3291,3 +3288,39 @@ class TestLeakAutoVarWindows : public TestFixture {
 };
 
 REGISTER_TEST(TestLeakAutoVarWindows)
+
+class TestLeakAutoVarPosix : public TestFixture {
+public:
+    TestLeakAutoVarPosix() : TestFixture("TestLeakAutoVarPosix") {}
+
+private:
+    const Settings settings = settingsBuilder().library("std.cfg").library("posix.cfg").build();
+
+    void check_(const char* file, int line, const char code[]) {
+        // Clear the error buffer..
+        errout.str("");
+
+        // Tokenize..
+        Tokenizer tokenizer(settings, this);
+        std::istringstream istr(code);
+        ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);
+
+        // Check for leaks..
+        runChecks<CheckLeakAutoVar>(tokenizer, this);
+    }
+
+    void run() override {
+        TEST_CASE(memleak_getline);
+    }
+
+    void memleak_getline() {
+        check("void f(std::ifstream &is) {\n" // #12297
+              "    std::string str;\n"
+              "    if (getline(is, str, 'x').good()) {};\n"
+              "    if (!getline(is, str, 'x').good()) {};\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+};
+
+REGISTER_TEST(TestLeakAutoVarPosix)