commit 5251e2d2125407bbff0c39394a4011be9ed8b5d0
author Pablo Neira Ayuso <pablo@netfilter.org> Wed Sep 20 12:01:06 2006 -0700
committer David S. Miller <davem@sunset.davemloft.net> Fri Sep 22 15:19:54 2006 -0700
tree 3dda0aeb90d80a2ddd0e7a4215bfe9eaa8209033
parent 01f348484dd8509254d045e3ad49029716eca6a1

[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>