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Code Issues Releases Wiki Activity

drm/msm: Fix possible uninitialized access in fbdev

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Do not run drm_fb_helper_unprepare() if fbdev allocation fails. Avoids
access to an uninitialized pointer. Original bug report is at [1].

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Fixes: 3fb1f62f80 ("drm/fb-helper: Remove drm_fb_helper_unprepare() from drm_fb_helper_fini()")
Link: https://lore.kernel.org/oe-kbuild-all/202302220810.9dymwCQ8-lkp@intel.com/ # 1
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/523715/
Link: https://lore.kernel.org/r/20230222123712.5049-1-tzimmermann@suse.de
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Thomas Zimmermann 2023-02-22 13:37:12 +01:00 committed by Rob Clark
parent 8a86f213f4
commit 796762f050
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/msm/msm_fbdev.c
View file

@ -136,13 +136,13 @@ static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
{
struct msm_drm_private *priv = dev->dev_private;
struct msm_fbdev *fbdev = NULL;
struct msm_fbdev *fbdev;
struct drm_fb_helper *helper;
int ret;
fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
if (!fbdev)
goto fail;
return NULL;
helper = &fbdev->base;