netdev - [PATCH] usbnet: cleanup after bind() in probe()

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Message-Id: <1457346670-24059-1-git-send-email-oneukum@suse.com>
Date:	Mon,  7 Mar 2016 11:31:10 +0100
From:	Oliver Neukum <oneukum@...e.com>
To:	andreyknvl@...il.com, linux-usb@...r.kernel.org,
	davem@...emloft.net, netdev@...r.kernel.org, bjorn@...k.no
Cc:	Oliver Neukum <oneukum@...e.com>, Oliver Neukum <ONeukum@...e.com>
Subject: [PATCH] usbnet: cleanup after bind() in probe()

In case bind() works, but a later error forces bailing
in probe() in error cases work and a timer may be scheduled.
They must be killed. This fixes an error case related to
the double free reported in
http://www.spinics.net/lists/netdev/msg367669.html
and needs to go on top of Linus' fix to cdc-ncm.

Signed-off-by: Oliver Neukum <ONeukum@...e.com>
---
 drivers/net/usb/usbnet.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 0b0ba7e..1079812 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c
@@ -1769,6 +1769,13 @@ out3:
 	if (info->unbind)
 		info->unbind (dev, udev);
 out1:
+	/* subdrivers must undo all they did in bind() if they
+	 * fail it, but we may fail later and a deferred kevent
+	 * may trigger an error resubmitting itself and, worse,
+	 * schedule a timer. So we kill it all just in case.
+	 */
+	cancel_work_sync(&dev->kevent);
+	del_timer_sync(&dev->delay);
 	free_netdev(net);
 out:
 	return status;
-- 
2.1.4