Marissa Wall 7f03a90e40 BACKPORT: packet: in packet_do_bind, test fanout with bind_lock held ... [ Upstream commit 4971613c1639d8e5f102c4e797c3bf8f83a5a69e ] 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. Bug: 69160446 Fixes: dc99f60069 ("packet: Add fanout support.") Change-Id: I899f9b6bcbd1d4b033388ef22c472857574bfc30 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Marissa Wall <marissaw@google.com> Signed-off-by: Siqi Lin <siqilin@google.com> CVE-2017-15649 Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>		2020-01-06 08:40:25 +01:00
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af_packet.c	BACKPORT: packet: in packet_do_bind, test fanout with bind_lock held	2020-01-06 08:40:25 +01:00
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