drm/simple_kms_helper: Fix NULL pointer dereference with no active CRTC

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It is possible that drm_simple_kms_plane_atomic_check called
with no CRTC set, e.g. when user-space application sets CRTC_ID/FB_ID
to 0 before doing any actual drawing. This leads to NULL pointer
dereference because in this case new CRTC state is NULL and must be
checked before accessing.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1519279759-7803-1-git-send-email-andr2000@gmail.com

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Oleksandr Andrushchenko 2018-02-22 08:09:19 +02:00 • committed by Daniel Vetter

parent 35152d1159

commit 4751cf733a

1 changed files with 3 additions and 7 deletions

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drivers/gpu/drm/drm_simple_kms_helper.c

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