Fix #10905, #11665 FN deallocuse (#5751)

Author: chrchr-github

lib/checkleakautovar.cpp

@@ -466,6 +466,9 @@ bool CheckLeakAutoVar::checkScope(const Token * const startToken,
             const Token * closingParenthesis = tok->linkAt(1);
             for (const Token *innerTok = tok->tokAt(2); innerTok && innerTok != closingParenthesis; innerTok = innerTok->next()) {
                 // TODO: replace with checkTokenInsideExpression()
+                const Token* const openingPar = isFunctionCall(innerTok);
+                if (!openingPar)
+                    checkTokenInsideExpression(innerTok, varInfo);
 
                 if (!isLocalVarNoAutoDealloc(innerTok, mTokenizer->isCPP()))
                     continue;
@@ -502,7 +505,6 @@ bool CheckLeakAutoVar::checkScope(const Token * const startToken,
                 }
 
                 // check for function call
-                const Token * const openingPar = isFunctionCall(innerTok);
                 if (openingPar) {
                     const Library::AllocFunc* allocFunc = mSettings->library.getDeallocFuncInfo(innerTok);
                     // innerTok is a function name
@@ -805,7 +807,8 @@ bool CheckLeakAutoVar::checkScope(const Token * const startToken,
             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);
-        }
+        } else if (Token::Match(tok, "%var% ."))
+            checkTokenInsideExpression(tok, varInfo);
     }
     ret(endToken, varInfo, true);
     return true;
@@ -930,8 +933,7 @@ void CheckLeakAutoVar::changeAllocStatus(VarInfo &varInfo, const VarInfo::AllocI
 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;
+    const bool isLeakIgnore = mSettings->library.isLeakIgnore(mSettings->library.getFunctionName(tokName));
     if (mSettings->library.getReallocFuncInfo(tokName))
         return;
 
@@ -990,6 +992,8 @@ void CheckLeakAutoVar::functionCall(const Token *tokName, const Token *tokOpenin
                         varAlloc.allocTok = arg;
                     }
                 }
+                else if (isLeakIgnore)
+                    checkTokenInsideExpression(arg, varInfo);
                 else
                     changeAllocStatus(varInfo, dealloc.type == 0 ? allocation : dealloc, tokName, arg);
             }

test/cfg/posix.c

@@ -859,7 +859,7 @@ void memleak_scandir(void)
        which is allocated via malloc(3).  If filter is NULL, all entries are
        selected.*/
 
-    // TODO: cppcheck-suppress memleak
+    // cppcheck-suppress memleak
 }
 
 void no_memleak_scandir(void)

test/testcondition.cpp

@@ -5202,6 +5202,16 @@ class TestCondition : public TestFixture {
               "    for (int i = 0; i < N; a[i++] = false);\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        check("void f() {\n" // #8192
+              "    for (int i = 0; i > 10; ++i) {}\n"
+              "}\n");
+        TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Condition 'i>10' is always false\n", "", errout.str());
+
+        check("void f() {\n"
+              "    for (int i = 1000; i < 20; ++i) {}\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:2]: (style) Condition 'i<20' is always false\n", errout.str());
     }
 
     void alwaysTrueTryCatch()

test/testleakautovar.cpp

@@ -112,6 +112,7 @@ class TestLeakAutoVar : public TestFixture {
         TEST_CASE(deallocuse11); // #8302
         TEST_CASE(deallocuse12);
         TEST_CASE(deallocuse13);
+        TEST_CASE(deallocuse14);
 
         TEST_CASE(doublefree1);
         TEST_CASE(doublefree2);
@@ -924,6 +925,25 @@ class TestLeakAutoVar : public TestFixture {
                       errout.str());
     }
 
+    void deallocuse14() {
+        check("struct S { void f(); };\n" // #10905
+              "void g() {\n"
+              "    S* s = new S;\n"
+              "    delete s;\n"
+              "    s->f();\n"
+              "}\n", true);
+        ASSERT_EQUALS("[test.cpp:5]: (error) Dereferencing 's' after it is deallocated / released\n",
+                      errout.str());
+
+        check("void f() {\n"
+              "    int *p = (int*)malloc(4);\n"
+              "    free(p);\n"
+              "    if (*p == 5) {}\n"
+              "}\n");
+        ASSERT_EQUALS("[test.c:4]: (error) Dereferencing 'p' after it is deallocated / released\n",
+                      errout.str());
+    }
+
     void doublefree1() {  // #3895
         check("void f(char *p) {\n"
               "    if (x)\n"
@@ -2996,7 +3016,14 @@ class TestLeakAutoVarStrcpy : public TestFixture {
               "    free(p);\n"
               "    strcpy(a, p);\n"
               "}");
-        TODO_ASSERT_EQUALS("error (free,use)", "", errout.str());
+        ASSERT_EQUALS("[test.cpp:3]: (error) Dereferencing 'p' after it is deallocated / released\n", errout.str());
+
+        check("void f(char *p, const char *q) {\n" // #11665
+              "    free(p);\n"
+              "    strcpy(p, q);\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:3]: (error) Dereferencing 'p' after it is deallocated / released\n",
+                      errout.str());
 
         check("void f(char *p) {\n"   // #3041 - assigning pointer when it's used
               "    free(p);\n"

test/testuninitvar.cpp

@@ -6335,6 +6335,21 @@ class TestUninitVar : public TestFixture {
                         "}");
         ASSERT_EQUALS("[test.cpp:15] -> [test.cpp:17]: (warning) Uninitialized variable: pwd\n", errout.str());
 
+        valueFlowUninit("size_t Read(unsigned char* buffer, size_t len);\n" // #11540
+                        "void f() {\n"
+                        "    const int N = 100;\n"
+                        "    uint8_t data[N];\n"
+                        "    size_t data_size = 0;\n"
+                        "    for (int i = 0; i < 10; i++) {\n"
+                        "        if (!data_size)\n"
+                        "            data_size = Read(data, N);\n"
+                        "        if (!data_size)\n"
+                        "            return;\n"
+                        "        if (data[0] == 0x47) {}\n"
+                        "    }\n"
+                        "}\n");
+        ASSERT_EQUALS("", errout.str());
+
         // #12033
         valueFlowUninit("void g(const char*p);\n"
                         "void f() {\n"