Fixed #5993 (FP: memleak (linux list))

lib/checkmemoryleak.cpp

@@ -1345,8 +1345,22 @@ Token *CheckMemoryLeakInFunction::getcode(const Token *tok, std::list<const Toke
         }
 
         // Linux lists..
-        if (varid > 0 && Token::Match(tok, "[=(,] & %varid% [.[,)]", varid)) {
+        if (varid > 0 && Token::Match(tok, "[=(,] & (| %varid% [.[,)]", varid)) {
-            addtoken(&rettail, tok, "&use");
+            // Is variable passed to a "leak-ignore" function?
+            bool leakignore = false;
+            if (Token::Match(tok, "[(,]")) {
+                const Token *parent = tok;
+                while (parent && parent->str() != "(")
+                    parent = parent->astParent();
+                if (parent && parent->astOperand1() && parent->astOperand1()->isName()) {
+                    const std::string &functionName = parent->astOperand1()->str();
+                    if (_settings->library.leakignore.find(functionName) != _settings->library.leakignore.end())
+                        leakignore = true;
+                }
+            }
+            // Not passed to "leak-ignore" function, add "&use".
+            if (!leakignore)
+                addtoken(&rettail, tok, "&use");
         }
     }
 

test/testmemleak.cpp

@@ -258,6 +258,7 @@ private:
         TEST_CASE(throw2);
 
         TEST_CASE(linux_list_1);
+        TEST_CASE(linux_list_2);
 
         TEST_CASE(sizeof1);
 
@@ -2855,6 +2856,14 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void linux_list_2() { // #5993
+        check("void foo() {\n"
+              "    struct AB *ab = malloc(sizeof(struct AB));\n"
+              "    list_add_tail(&(ab->list));\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
+    }
+
 
 
     void sizeof1() {