Fix 13410: False negative: invalidContainer when taking address of dereferenced iterator (danmar#7109)

Author: pfultz2

lib/checkstl.cpp

@@ -1094,10 +1094,13 @@ static const ValueFlow::Value* getInnerLifetime(const Token* tok,
             if (val.isInconclusive())
                 return nullptr;
             if (val.capturetok)
-                return getInnerLifetime(val.capturetok, id, errorPath, depth - 1);
+                if (const ValueFlow::Value* v = getInnerLifetime(val.capturetok, id, errorPath, depth - 1))
+                    return v;
             if (errorPath)
                 errorPath->insert(errorPath->end(), val.errorPath.cbegin(), val.errorPath.cend());
-            return getInnerLifetime(val.tokvalue, id, errorPath, depth - 1);
+            if (const ValueFlow::Value* v = getInnerLifetime(val.tokvalue, id, errorPath, depth - 1))
+                return v;
+            continue;
         }
         if (!val.tokvalue->variable())
             continue;

test/teststl.cpp

@@ -6365,6 +6365,17 @@ class TestStl : public TestFixture {
               "}\n",
               true);
         ASSERT_EQUALS("", errout_str());
+
+        // #13410
+        check("int f(std::vector<int>& v) {\n"
+              "    const int* i = &*v.cbegin();\n"
+              "    v.push_back(1);\n"
+              "    return *i;\n"
+              "}\n",
+              true);
+        ASSERT_EQUALS(
+            "[test.cpp:1] -> [test.cpp:2] -> [test.cpp:1] -> [test.cpp:2] -> [test.cpp:2] -> [test.cpp:3] -> [test.cpp:1] -> [test.cpp:4]: (error) Using pointer to local variable 'v' that may be invalid.\n",
+            errout_str());
     }
 
     void invalidContainerLoop() {