[PATCH 0/2] drm/nouveau: Fix NULL pointer dereferences in GETPARAM and GET_ZCULL_INFO ioctls

[Jim Cromie <jim.cromie@gmail.com>]

When Nouveau initialization is incomplete (e.g. firmware microcode fails
to load or graphics engine initialization aborts early), userspace display
servers (GNOME/Mesa) probing device capabilities trigger fatal kernel NULL
pointer dereferences in the Nouveau ioctl handlers.

This 2-patch series fixes two distinct NULL pointer crash paths:

1. drm/nouveau: Fix NULL pointer dereferences in GETPARAM ioctl
   - Prevents NULL dereference of gr, gr->func, and nvkm_device->func in
     nouveau_abi16_ioctl_getparam(). Returns -ENODEV cleanly.

2. drm/nouveau: Fix NULL pointer dereference in GET_ZCULL_INFO ioctl
   - Checks that gr is non-NULL before inspecting gr->has_zcull_info at
     offset 0xf0 in nouveau_abi16_ioctl_get_zcull_info().

Both bugs were reproduced and verified fixed on GA107 (NVIDIA GeForce
RTX 3050 Mobile) running 7.2-rc7 under GNOME Wayland desktop initialization.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
Jim Cromie (2):
      drm/nouveau: Fix NULL pointer dereferences in GETPARAM ioctl
      drm/nouveau: Fix NULL pointer dereference in GET_ZCULL_INFO ioctl

 drivers/gpu/drm/nouveau/nouveau_abi16.c | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)
---
base-commit: db2ddb87143519e20a95aa36c60b36107b736a58
change-id: 20260815-null-fixes-5e9e86666a5d

Best regards,
-- 
Jim Cromie <jim.cromie@gmail.com>