From: Patrick McHardy <kaber@trash.net>
Date: Thu, 22 Mar 2007 19:25:20 +0000 (-0700)
Subject: [BRIDGE]: Fix fdb RCU race
X-Git-Tag: v2.6.21-rc5~45^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b19cbe2a1695c09c74f83646c4b82b51123b3690;p=pandora-kernel.git

[BRIDGE]: Fix fdb RCU race

br_fdb_get use atomic_inc to increase the refcount of an element found
on a RCU protected list, which can lead to the following race:

CPU0					CPU1

					br_fdb_get:   rcu_read_lock
					__br_fdb_get: find element
fdb_delete:   hlist_del_rcu
	      br_fdb_put
br_fdb_put:   atomic_dec_and_test
	      call_rcu(fdb_rcu_free)	br_fdb_get:   atomic_inc
						      rcu_read_unlock
fdb_rcu_free: kmem_cache_free

Use atomic_inc_not_zero instead.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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