Partial fix for #11567 FN nullPointer/ctunullpointer with default parameter (regression) (danmar#6565)

Author: chrchr-github

lib/valueflow.cpp

@@ -6941,7 +6941,7 @@ static void valueFlowFunctionDefaultParameter(const TokenList& tokenlist, const
             continue;
         for (std::size_t arg = function->minArgCount(); arg < function->argCount(); arg++) {
             const Variable* var = function->getArgumentVar(arg);
-            if (var && var->hasDefault() && Token::Match(var->nameToken(), "%var% = %num%|%str% [,)]")) {
+            if (var && var->hasDefault() && Token::Match(var->nameToken(), "%var% = %num%|%str%|%char%|%name% [,)]")) {
                 const std::list<ValueFlow::Value> &values = var->nameToken()->tokAt(2)->values();
                 std::list<ValueFlow::Value> argvalues;
                 for (const ValueFlow::Value &value : values) {

test/testnullpointer.cpp

@@ -4405,6 +4405,10 @@ class TestNullPointer : public TestFixture {
               "    int var1 = x ? *p : 5;\n"
               "}");
         ASSERT_EQUALS("[test.cpp:2]: (warning) Possible null pointer dereference if the default parameter value is used: p\n", errout_str());
+
+        check("void f(int* i = nullptr) { *i = 0; }\n" // #11567
+              "void g() { f(); }\n");
+        ASSERT_EQUALS("[test.cpp:1]: (warning) Possible null pointer dereference if the default parameter value is used: i\n", errout_str());
     }
 
     void nullpointer_internal_error() { // ticket #5080