[PATCH] Fix Null Pointer Dereference in uvcg_video_init()

[Jeffin Philip]

uvcg_video_init references video->uvc before assigning it
leading to a null pointer dereference. Fix this by assigning
video->uvc first and then dereferencing it later.

Reported-by: syzbot+8dcac923582c28505fd7@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: https://syzkaller.appspot.com/bug?extid=8dcac923582c28505fd7
Signed-off-by: Jeffin Philip <jeffinphilip14@xxxxxxxxx>
---
 drivers/usb/gadget/function/uvc_video.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index 2f9700b3f1b6..cb532654b9b8 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -806,6 +806,7 @@ int uvcg_video_enable(struct uvc_video *video)
  */
 int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc)
 {
+	video->uvc = uvc;
 	video->is_enabled = false;
 	INIT_LIST_HEAD(&video->ureqs);
 	INIT_LIST_HEAD(&video->req_free);
@@ -829,7 +830,6 @@ int uvcg_video_init(struct uvc_video *video, struct uvc_device *uvc)
 
 	sched_set_fifo(video->kworker->task);
 
-	video->uvc = uvc;
 	video->fcc = V4L2_PIX_FMT_YUYV;
 	video->bpp = 16;
 	video->width = 320;
-- 
2.55.0