From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Thu, 18 Nov 2010 17:30:42 +0000 (-0800)
Subject: bonding: fix a race in IGMP handling
X-Git-Tag: v2.6.37-rc3~3^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3006bc38895895f1a0352c2e17e1a503f35f7e2f;p=pandora-kernel.git

bonding: fix a race in IGMP handling

RCU conversion in IGMP code done in net-next-2.6 raised a race in
__bond_resend_igmp_join_requests().

It iterates in_dev->mc_list without appropriate protection (RTNL, or
read_lock on in_dev->mc_list_lock).

Another cpu might delete an entry while we use it and trigger a fault.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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