drm/gud: fix NULL fb and crtc dereferences on USB disconnect

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commit dc2d5ddb19 upstream.

On disconnect drm_atomic_helper_disable_all() is called which
sets both the fb and crtc for a plane to NULL before invoking a commit.

This causes a kernel oops on every display disconnect.

Add guards for those dereferences.

Cc: <stable@vger.kernel.org> # 6.18.x
Fixes: 73cfd166e0 ("drm/gud: Replace simple display pipe with DRM atomic helpers")
Signed-off-by: Shenghao Yang <me@shenghaoyang.info>
Reviewed-by: Ruben Wauters <rubenru09@aol.com>
Signed-off-by: Ruben Wauters <rubenru09@aol.com>
Link: https://patch.msgid.link/20251231055039.44266-1-me@shenghaoyang.info
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Shenghao Yang 2025-12-31 13:50:26 +08:00 • committed by Greg Kroah-Hartman

parent 67dfd9e856

commit a255ec07f9

1 changed files with 8 additions and 12 deletions

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drivers/gpu/drm/gud/gud_pipe.c

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