Linux-USB Archive on lore.kernel.org
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From: Johan Hovold <johan@kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org, Johan Hovold <johan@kernel.org>
Subject: [PATCH 2/3] USB: usb-skeleton: fix use-after-free after driver unbind
Date: Wed,  9 Oct 2019 19:09:43 +0200
Message-ID: <20191009170944.30057-3-johan@kernel.org> (raw)
In-Reply-To: <20191009170944.30057-1-johan@kernel.org>

The driver failed to stop its read URB on disconnect, something which
could lead to a use-after-free in the completion handler after driver
unbind in case the character device has been closed.

Fixes: e7389cc9a7ff ("USB: skel_read really sucks royally")
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/usb-skeleton.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index c2843fcfa52d..be311787403e 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -575,6 +575,7 @@ static void skel_disconnect(struct usb_interface *interface)
 	dev->disconnected = 1;
 	mutex_unlock(&dev->io_mutex);
 
+	usb_kill_urb(dev->bulk_in_urb);
 	usb_kill_anchored_urbs(&dev->submitted);
 
 	/* decrement our usage count */
-- 
2.23.0


  parent reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 17:09 [PATCH 0/3] USB: usb-skeleton: regression fix Johan Hovold
2019-10-09 17:09 ` [PATCH 1/3] USB: usb-skeleton: fix NULL-deref on disconnect Johan Hovold
2019-10-09 17:09 ` Johan Hovold [this message]
2019-10-09 17:09 ` [PATCH 3/3] USB: usb-skeleton: drop redundant in-urb check Johan Hovold

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