From: Neil Horman <nhorman@tuxdriver.com>
Date: Fri, 27 Apr 2012 10:11:49 +0000 (+0000)
Subject: drop_monitor: Make updating data->skb smp safe
X-Git-Tag: v3.2.27~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ea39e338f9bb5eb5b3e568cbe7475549d67ef128;p=pandora-kernel.git

drop_monitor: Make updating data->skb smp safe

commit 3885ca785a3618593226687ced84f3f336dc3860 upstream.

Eric Dumazet pointed out to me that the drop_monitor protocol has some holes in
its smp protections.  Specifically, its possible to replace data->skb while its
being written.  This patch corrects that by making data->skb an rcu protected
variable.  That will prevent it from being overwritten while a tracepoint is
modifying it.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: David Miller <davem@davemloft.net>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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