Willem de Bruijn 63364a508d packet: fix tp_reserve race in packet_set_ring
[ Upstream commit c27927e372f0785f3303e8fad94b85945e2c97b7 ]

Updates to tp_reserve can race with reads of the field in
packet_set_ring. Avoid this by holding the socket lock during
updates in setsockopt PACKET_RESERVE.

This bug was discovered by syzkaller.

Fixes: 8913336a7e8d ("packet: add PACKET_RESERVE sockopt")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-08-12 19:29:08 -07:00
..
2017-05-02 21:19:55 -07:00
2015-11-23 14:56:15 -05:00
2015-11-02 22:47:14 -05:00
2017-08-06 19:19:38 -07:00
2015-10-07 04:27:43 -07:00
2015-10-21 00:49:24 +02:00