Re: [PATCH v2 2/3] nouveau: Fix NULL pointer dereference in GET_ZCULL_INFO ioctl

[Danilo Krummrich]

On Fri Oct 9, 2026 at 7:44 PM CEST, Jim Cromie via B4 Relay wrote:
> From: Jim Cromie <jim.cromie@xxxxxxxxx>
>
> When graphics engine firmware fails to load or initialization aborts
> early, nvxx_gr(drm) returns NULL. Calling DRM_IOCTL_NOUVEAU_GET_ZCULL_INFO
> causes nouveau_abi16_ioctl_get_zcull_info() to dereference gr at offset
> 0xf0 without checking for NULL, triggering a kernel page fault.
>
> Validate that gr is non-NULL before inspecting gr->has_zcull_info.
>
> Signed-off-by: Jim Cromie <jim.cromie@xxxxxxxxx>

Please add a Fixes: tag and CC stable.