From: Julian Anastasov <ja@ssi.bg>
Date: Thu, 12 Sep 2013 08:21:08 +0000 (+0300)
Subject: ipvs: do not use dest after ip_vs_dest_put in LBLC
X-Git-Tag: v3.12-rc4~30^2~4^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f3d771a35fee21a1f17364b46b3c8cc66dc6892;p=pandora-kernel.git

ipvs: do not use dest after ip_vs_dest_put in LBLC

commit c2a4ffb70eef39 ("ipvs: convert lblc scheduler to rcu")
allows RCU readers to use dest after calling ip_vs_dest_put().
In the corner case it can race with ip_vs_dest_trash_expire()
which can release the dest while it is being returned to the
RCU readers as scheduling result.

To fix the problem do not allow en->dest to be replaced and
defer the ip_vs_dest_put() call by using RCU callback. Now
en->dest does not need to be RCU pointer.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
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