From: Eric Dumazet <edumazet@google.com>
Date: Tue, 16 Jun 2015 14:59:11 +0000 (-0700)
Subject: packet: read num_members once in packet_rcv_fanout()
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~134^2~2^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f98f4514d07871da7a113dd9e3e330743fd70ae4;p=pandora-kernel.git

packet: read num_members once in packet_rcv_fanout()

We need to tell compiler it must not read f->num_members multiple
times. Otherwise testing if num is not zero is flaky, and we could
attempt an invalid divide by 0 in fanout_demux_cpu()

Note bug was present in packet_rcv_fanout_hash() and
packet_rcv_fanout_lb() but final 3.1 had a simple location
after commit 95ec3eb417115fb ("packet: Add 'cpu' fanout policy.")

Fixes: dc99f600698dc ("packet: Add fanout support.")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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