From: David S. Miller <davem@davemloft.net>
Date: Wed, 5 Jan 2011 23:38:53 +0000 (-0800)
Subject: af_unix: Avoid socket->sk NULL OOPS in stream connect security hooks.
X-Git-Tag: v2.6.38-rc1~476^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3610cda53f247e176bcbb7a7cca64bc53b12acdb;p=pandora-kernel.git

af_unix: Avoid socket->sk NULL OOPS in stream connect security hooks.

unix_release() can asynchornously set socket->sk to NULL, and
it does so without holding the unix_state_lock() on "other"
during stream connects.

However, the reverse mapping, sk->sk_socket, is only transitioned
to NULL under the unix_state_lock().

Therefore make the security hooks follow the reverse mapping instead
of the forward mapping.

Reported-by: Jeremy Fitzhardinge <jeremy@goop.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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