Fix #13367: (crash) nullptr dereference in checkStructMemberUsage()

[ludviggunne]

No description provided.

[danmar]

Please mention in the PR title if it's a False Negative or False Positive. It will make the git log more clear..

[danmar]

Spontanously there seems to be a problem with the AST. That should be fixed first. When I run these commands:

daniel@laptop:~/cppchecksolutions/cppcheck$ cat 13367.cpp 
typedef struct pathNode_s {
    struct pathNode_s*  next;
} pathNode_t;\n"

void f() {
    x<pathNode_t, offsetof( pathNode_t, next )> y;
}
daniel@laptop:~/cppchecksolutions/cppcheck$ ./cppcheck --dump 13367.cpp 

in the dump output I get; the "offsetof" does not have a astParent(), can you reproduce that also?

[ludviggunne]

in the dump output I get; the "offsetof" does not have a astParent(), can you reproduce that also?

Yep, I saw that too. I figured since the match pattern was so specific this would be sufficient. So the template arguments not haveing astParent etc. is a bug? I wasn't sure since template arguments seem to be treated differently in general.

[danmar]

ok I allow it I am not sure if it's a bug.