tree e48bffea6f290c61844781b165409cbc36b2f4e9
parent 2dab80a8b486f02222a69daca6859519e05781d9
author Eric Dumazet <edumazet@google.com> 1434466751 -0700
committer David S. Miller <davem@davemloft.net> 1434903802 -0700

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>