[Bug sanitizer/95279] UBSan doesn't seem to detect pointer overflow in certain cases

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95279

--- Comment #11 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #9)
> pointer-overflow is a cheap check without any context, for ptr + off
> it will do
> uintptr_t res = (uintptr_t) ptr + off;
> if (((intptr_t) res) < 0 ? res > (uintptr_t) ptr : res < (uintptr_t) ptr)
> runtime_diagnostics ();

Mistyped, (intptr_t) off rather than (intptr_t) res obviously.