netdev - mpls's find

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Date:	Thu, 07 Apr 2016 21:41:09 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	roopa@...ulusnetworks.com
CC:	netdev@...r.kernel.org
Subject: mpls's find_outdev()

While auditing something unrelated, I noticed that this function seems
to potentially dev_put() on an error pointer.

I guess the problem comes from the fact that there are two methods
by which the device pointer is obtained.

First, inet{,6}_fib_lookup_dev() which uses error pointers.

Second, dev_get_by_index() which returns a valid device or NULL,
and therefore does not use error pointers.

If inet{,6}_fib_lookup_dev() returns an error pointer, the !dev check
will not pass and dev_put() will operate on an error pointer and
crash.

If you agree with my analysis, could you please cook up and test a
fix?

Thank you!