Fix #11393 FP danglingLifetime with pointer to pointer (danmar#7226)

Author: chrchr-github

lib/checkautovariables.cpp

@@ -648,6 +648,7 @@ void CheckAutoVariables::checkVarLifetimeScope(const Token * start, const Token
                     if (var && !var->isLocal() && !var->isArgument() && !(val.tokvalue && val.tokvalue->variable() && val.tokvalue->variable()->isStatic()) &&
                         !isVariableChanged(nextTok,
                                            tok->scope()->bodyEnd,
+                                           var->valueType() ? var->valueType()->pointer : 0,
                                            var->declarationId(),
                                            var->isGlobal(),
                                            *mSettings)) {

test/testautovariables.cpp

@@ -990,6 +990,21 @@ class TestAutoVariables : public TestFixture {
               "  int *ptr;\n"
               "};");
         ASSERT_EQUALS("", errout_str());
+
+        check("struct R {\n" // #11393
+              "    void pop() { p = nullptr; };\n"
+              "    int* p;\n"
+              "};\n"
+              "struct T {\n"
+              "    void f();\n"
+              "    R* r;\n"
+              "};\n"
+              "void T::f() {\n"
+              "    int i = 0;\n"
+              "    r->p = &i;\n"
+              "    r->pop();\n"
+              "}\n");
+        ASSERT_EQUALS("", errout_str());
     }
 
     void returnLocalVariable1() {