[PATCH] gpu/drm/drm_framebuffer.c: Add judgement for return value of drm_get_format_info().

[Peng Hao]

Since drm_get_format_info() may return NULL, so a judgement of return
value is needed to add.

Signed-off-by: Peng Hao <penghao at dingdao.com>
---
 drivers/gpu/drm/drm_framebuffer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index aff3746dedfb..be7dd1998c04 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -194,6 +194,10 @@ static int framebuffer_check(struct drm_device *dev,
 
 	/* now let the driver pick its own format info */
 	info = drm_get_format_info(dev, r);
+	if (!info) {
+		drm_dbg_kms(dev, "no matched format info\n");
+		return -EFAULT;
+	}
 
 	for (i = 0; i < info->num_planes; i++) {
 		unsigned int width = fb_plane_width(r->width, info, i);
-- 
2.37.1