From: Veaceslav Falico <vfalico@redhat.com>
Date: Thu, 20 Feb 2014 11:07:57 +0000 (+0100)
Subject: bonding: fix bond_arp_rcv() race of curr_active_slave
X-Git-Tag: v3.15-rc1~113^2~290
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=010d3c3989706d800ae72253773fa6537cc9f74c;p=pandora-kernel.git

bonding: fix bond_arp_rcv() race of curr_active_slave

bond->curr_active_slave can be changed between its deferences, even to
NULL, and thus we might panic.

We're always holding the rcu (rx_handler->bond_handle_frame()->bond_arp_rcv())
so fix this by rcu_dereferencing() it and using the saved.

Reported-by: Ding Tianhong <dingtianhong@huawei.com>
Fixes: aeea64a ("bonding: don't trust arp requests unless active slave really works")
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Acked-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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