From: xueminsu <xuemin.su@xxxxxxxxx>
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@xxxxxxxxx>
---
drivers/gpu/drm/drm_crtc.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index f2d667b..b748498 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2172,6 +2172,13 @@ 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 */
+ if (!fb) {
+ WARN(1, "%pf should not return NULL.",
+ dev->mode_config.funcs->fb_create);
+ ret = -EINVAL;
+ goto out;
+ }
or->fb_id = fb->base.id;
list_add(&fb->filp_head, &file_priv->fbs);
--
1.7.6
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