From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Wed, 20 Sep 2006 19:01:06 +0000 (-0700)
Subject: [NETFILTER]: conntrack: fix race condition in early_drop
X-Git-Tag: v2.6.19-rc1~1272^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5251e2d2125407bbff0c39394a4011be9ed8b5d0;p=pandora-kernel.git

[NETFILTER]: conntrack: fix race condition in early_drop

On SMP environments the maximum number of conntracks can be overpassed
under heavy stress situations due to an existing race condition.

        CPU A                   CPU B
     atomic_read()               ...
     early_drop()                ...
        ...                  atomic_read()
   allocate conntrack      allocate conntrack
     atomic_inc()             atomic_inc()

This patch moves the counter incrementation before the early drop stage.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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