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drm/fb_dma: Add checks in drm_fb_dma_get_scanout_buffer()

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plane->state and plane->state->fb can be NULL, so add a check before
dereferencing them.
Found by testing with the imx driver.

Fixes: 879b3b6511fe ("drm/fb_dma: Add generic get_scanout_buffer() for drm_panic")
Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20240426121121.241366-1-jfalempe@redhat.com
(cherry picked from commit 986c12d8c9a677c094c37bd6aa636b4d4c5ccd46)
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
This commit is contained in:
Jocelyn Falempe 2024-04-26 14:10:50 +02:00 committed by Maarten Lankhorst
parent 87cb4a612a
commit 514ca22a25
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/drm_fb_dma_helper.c
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@ -167,6 +167,9 @@ int drm_fb_dma_get_scanout_buffer(struct drm_plane *plane,
struct drm_gem_dma_object *dma_obj;
struct drm_framebuffer *fb;
if (!plane->state || !plane->state->fb)
return -EINVAL;
fb = plane->state->fb;
/* Only support linear modifier */
if (fb->modifier != DRM_FORMAT_MOD_LINEAR)