Willem de Bruijn 4971613c16 packet: in packet_do_bind, test fanout with bind_lock held ... Once a socket has po->fanout set, it remains a member of the group until it is destroyed. The prot_hook must be constant and identical across sockets in the group. If fanout_add races with packet_do_bind between the test of po->fanout and taking the lock, the bind call may make type or dev inconsistent with that of the fanout group. Hold po->bind_lock when testing po->fanout to avoid this race. I had to introduce artificial delay (local_bh_enable) to actually observe the race. Fixes: dc99f60069 ("packet: Add fanout support.") Signed-off-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-09-28 10:24:31 -07:00
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af_packet.c	packet: in packet_do_bind, test fanout with bind_lock held	2017-09-28 10:24:31 -07:00
diag.c	packet: pdiag_put_ring() should return TX_RING info for TPACKET_V3	2017-01-10 21:02:42 -05:00
internal.h	net: convert packet_fanout.sk_ref from atomic_t to refcount_t	2017-07-01 07:39:09 -07:00
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