linux-kernel - [PATCH] mceusb: Return without resubmitting URB in case of -EPROTO error.

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Message-Id: <20210818203110.1430449-1-rajatasthana4@gmail.com>
Date:   Thu, 19 Aug 2021 02:01:10 +0530
From:   Rajat Asthana <rajatasthana4@...il.com>
To:     sean@...s.org, mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Rajat Asthana <rajatasthana4@...il.com>,
        syzbot+4d3749e9612c2cfab956@...kaller.appspotmail.com
Subject: [PATCH] mceusb: Return without resubmitting URB in case of -EPROTO error.

Syzkaller reported a warning called "rcu detected stall in dummy_timer".

The error seems to be an error in mceusb_dev_recv(). In the case of
-EPROTO error, the routine immediately resubmits the URB. Instead it
should return without resubmitting URB.

Reported-by: syzbot+4d3749e9612c2cfab956@...kaller.appspotmail.com
Signed-off-by: Rajat Asthana <rajatasthana4@...il.com>
---
 drivers/media/rc/mceusb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/rc/mceusb.c b/drivers/media/rc/mceusb.c
index 5642595a057e..8870c4e6c5f4 100644
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -1386,6 +1386,7 @@ static void mceusb_dev_recv(struct urb *urb)
 	case -ECONNRESET:
 	case -ENOENT:
 	case -EILSEQ:
+	case -EPROTO:
 	case -ESHUTDOWN:
 		usb_unlink_urb(urb);
 		return;
-- 
2.32.0