[PATCH] nouveau/dmem: handle kcalloc() allocation failure

[Timur Tabi]

On Sun, Mar 3, 2024 at 4:46 AM Duoming Zhou <duoming at zju.edu.cn> wrote:
>
> The kcalloc() in nouveau_dmem_evict_chunk() will return null if
> the physical memory has run out. As a result, if we dereference
> src_pfns, dst_pfns or dma_addrs, the null pointer dereference bugs
> will happen.
>
> This patch uses stack variables to replace the kcalloc().

Won't this blow the stack?  And why not just test the return value of kcalloc?