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

[joseph at codesourcery dot com]

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

--- Comment #14 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I think it's invalid to refer to element (size_t)-1 of an array; that the 
actual integer value used has to be within the range of available array 
elements.

It's entirely possible that such an invalid usage is nevertheless 
widespread in practice.