Fix #9658 FP doubleFree after non-returning function pointer (#6590)

Author: chrchr-github

lib/library.cpp

@@ -1715,6 +1715,8 @@ bool Library::isnoreturn(const Token *ftok) const
 {
     if (ftok->function() && ftok->function()->isAttributeNoreturn())
         return true;
+    if (ftok->variable() && ftok->variable()->nameToken()->isAttributeNoreturn())
+        return true;
     if (isNotLibraryFunction(ftok)) {
         if (Token::simpleMatch(ftok->astParent(), ".")) {
             const Token* contTok = ftok->astParent()->astOperand1();

test/testleakautovar.cpp

@@ -131,6 +131,7 @@ class TestLeakAutoVar : public TestFixture {
         TEST_CASE(exit1);
         TEST_CASE(exit2);
         TEST_CASE(exit3);
+        TEST_CASE(exit4);
 
         // handling function calls
         TEST_CASE(functioncall1);
@@ -1784,6 +1785,19 @@ class TestLeakAutoVar : public TestFixture {
         ASSERT_EQUALS("", errout_str());
     }
 
+    void exit4() {
+        check("void __attribute__((__noreturn__)) (*func_notret)(void);\n"
+              "int main(int argc) {\n"
+              "    void* ptr = malloc(1000);\n"
+              "    if (argc == 1) {\n"
+              "        free(ptr);\n"
+              "        func_notret();\n"
+              "    }\n"
+              "    free(ptr);\n"
+              "}");
+        ASSERT_EQUALS("", errout_str());
+    }
+
     void functioncall1() {
         check("void f(struct S *p) {\n"
               "  p->x = malloc(10);\n"