linux-kernel - [PATCH] media: uvcvideo: Fix deadlock during uvc

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Message-Id: <20241022-race-unreg-v1-1-2212f364d9de@chromium.org>
Date: Tue, 22 Oct 2024 08:30:30 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Sergey Senozhatsky <senozhatsky@...omium.org>, 
 Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 syzbot+9446d5e0d25571e6a212@...kaller.appspotmail.com, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH] media: uvcvideo: Fix deadlock during uvc_probe

If uvc_probe() fails, it can end up calling uvc_status_unregister() before
uvc_status_init() is called.

Fix this by checking if dev->status is NULL or not in
uvc_status_unregister()

Reported-by: syzbot+9446d5e0d25571e6a212@...kaller.appspotmail.com
Closes: https://lore.kernel.org/linux-media/20241020160249.GD7770@pendragon.ideasonboard.com/T/#m506744621d72a2ace5dd2ab64055be9898112dbd
Fixes: c5fe3ed618f9 ("media: uvcvideo: Avoid race condition during unregister")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_status.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c
index 06c867510c8f..b3527895c2f6 100644
--- a/drivers/media/usb/uvc/uvc_status.c
+++ b/drivers/media/usb/uvc/uvc_status.c
@@ -294,6 +294,8 @@ int uvc_status_init(struct uvc_device *dev)
 
 void uvc_status_unregister(struct uvc_device *dev)
 {
+	if (!dev->status)
+		return;
 	uvc_status_suspend(dev);
 	uvc_input_unregister(dev);
 }

---
base-commit: 698b6e3163bafd61e1b7d13572e2c42974ac85ec
change-id: 20241022-race-unreg-85295d5fbeee

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>