linux-kernel - [ 24/26] can: usb_8dev: unregister netdev before free()ing

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20130701200732.588148188@linuxfoundation.org>
Date:	Mon,  1 Jul 2013 13:10:19 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michael Olbrich <m.olbrich@...gutronix.de>,
	Bernd Krumboeck <krumboeck@...versalnet.at>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Oliver Hartkopp <socketcan@...tkopp.net>
Subject: [ 24/26] can: usb_8dev: unregister netdev before free()ing

3.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Kleine-Budde <mkl@...gutronix.de>

commit 4afe2156eb639e563d6ef0c2706b66ea400348b2 upstream.

The usb_8dev hardware has problems on some xhci USB hosts. The driver fails to
read the firmware revision in the probe function. This leads to the following
Oops:

    [ 3356.635912] kernel BUG at net/core/dev.c:5701!

The driver tries to free the netdev, which has already been registered, without
unregistering it.

This patch fixes the problem by unregistering the netdev in the error path.

Reported-by: Michael Olbrich <m.olbrich@...gutronix.de>
Reviewed-by: Bernd Krumboeck <krumboeck@...versalnet.at>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Oliver Hartkopp <socketcan@...tkopp.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/can/usb/usb_8dev.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/net/can/usb/usb_8dev.c
+++ b/drivers/net/can/usb/usb_8dev.c
@@ -977,7 +977,7 @@ static int usb_8dev_probe(struct usb_int
 	err = usb_8dev_cmd_version(priv, &version);
 	if (err) {
 		netdev_err(netdev, "can't get firmware version\n");
-		goto cleanup_cmd_msg_buffer;
+		goto cleanup_unregister_candev;
 	} else {
 		netdev_info(netdev,
 			 "firmware: %d.%d, hardware: %d.%d\n",
@@ -989,6 +989,9 @@ static int usb_8dev_probe(struct usb_int
 
 	return 0;
 
+cleanup_unregister_candev:
+	unregister_netdev(priv->netdev);
+
 cleanup_cmd_msg_buffer:
 	kfree(priv->cmd_msg_buffer);
 


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/