Re: [GIT PULL] Enable -Wstringop-overflow globally

[Linus Torvalds]

On Fri, 26 Jan 2024 at 14:24, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>
> I think xe has some other weird problems too. This may be related (under
> allocating):
>
> ../drivers/gpu/drm/xe/xe_vm.c: In function 'xe_vma_create':
> ../drivers/gpu/drm/xe/xe_vm.c:806:21: warning: allocation of insufficient size '224' for type 'struct xe_vma' with size '368' [-Walloc-size]
>   806 |                 vma = kzalloc(sizeof(*vma) - sizeof(struct xe_userptr),
>       |                     ^

That code is indeed odd, but there's a comment in the xe_vma definition

        /**
         * @userptr: user pointer state, only allocated for VMAs that are
         * user pointers
         */
        struct xe_userptr userptr;

although I agree that it should probably simply be made a final
variably-sized array instead (and then you make that array size be
0/1).

               Linus