From: xueminsu xuemin.su@intel.com Date: Tue, 22 Jan 2013 22:39:39 +0800 Subject: [PATCH] drm_crtc: check if fb_create return NULL
Some buggy driver may still return NULL in fb_create, which leads to kernel panic.
Signed-off-by: xueminsu xuemin.su@intel.com --- drivers/gpu/drm/drm_crtc.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index f2d667b..ae613ec 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -2172,6 +2172,8 @@ int drm_mode_addfb(struct drm_device *dev, ret = PTR_ERR(fb); goto out; } + /* some buggy driver may return NULL here, which may cause panic */ + BUG_ON(!fb);
or->fb_id = fb->base.id; list_add(&fb->filp_head, &file_priv->fbs);