Commit e034b8a1 authored by Thomas Zimmermann's avatar Thomas Zimmermann
Browse files

drm/msm: Fix possible uninitialized access in fbdev 



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: default avatarkernel test robot <lkp@intel.com>
Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Fixes: 3fb1f62f ("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: default avatarDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230222123712.5049-1-tzimmermann@suse.de
parent 3fb1f62f

drivers/gpu/drm/msm/msm_fbdev.c

+2 −2
Original line number Diff line number Diff line
@@ -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;