drm/fb-helper: Fix drm_fb_helper_hotplug_event() NULL ptr argument

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drm_fb_helper_hotplug_event() should tolerate the fb_helper argument being
NULL. Commit 03a9606e7f ("drm/fb-helper: Avoid race with DRM userspace")
introduced a fb_helper dereference before the NULL check.
Fixup by moving the dereference after the NULL check.

Fixes: 03a9606e7f ("drm/fb-helper: Avoid race with DRM userspace")
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190515132925.48867-1-noralf@tronnes.org

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This commit is contained in:

Noralf Trønnes 2019-05-15 15:29:25 +02:00

parent 86d804f41e

commit 0586576950

1 changed files with 2 additions and 3 deletions

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drivers/gpu/drm/drm_fb_helper.c

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