fsanitize: member access within null pointer

[Kornel Benko]

Am Mon, 27 Dec 2021 10:41:49 +0100
schrieb Pavel Sanda <sanda at lyx.org>:

> On Sun, Dec 26, 2021 at 09:48:11AM +0100, Kornel Benko wrote:
> > > I guess clang is not happy with (((struct sockaddr_un *) 0)->sun_path)
> > > 
> > > Our own code has:
> > > #if !defined(SUN_LEN)
> > > #define SUN_LEN(su) \
> > >         (sizeof (*(su)) - sizeof ((su)->sun_path) + strlen((su)->sun_path))
> > > #endif  
> > 
> > That was a good guess! With the attached change the message does not appear anymore.  
> 
> Apart from that error message is there some functional problem for LyX?

Not that I am aware of. It manifests only at runtime with sanitize + clang ...

> Otherwise I would leave things as they are, it's not our code and sooner
> or later someone will report this to libc maintainers.

I think it is unlikely (who else is using sanitize + clang with this code?)

> (Or it could be
> you? :)

:(

> Or add a comment once we forget...

Maybe some native English speaker would fit here better.

> Pavel

	Kornel
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