ipv6: tcp: add a missing tcp_v6_restore_cb()
authorEric Dumazet <edumazet@google.com>
Mon, 6 Feb 2017 04:23:22 +0000 (20:23 -0800)
committerDavid S. Miller <davem@davemloft.net>
Mon, 6 Feb 2017 15:52:45 +0000 (10:52 -0500)
commitebf6c9cb23d7e56eec8575a88071dec97ad5c6e2
tree408df47ccbf5f9ee7d12dcf9f9583b18ff0a2b30
parent7892032cfe67f4bde6fc2ee967e45a8fbaf33756
ipv6: tcp: add a missing tcp_v6_restore_cb()

Dmitry reported use-after-free in ip6_datagram_recv_specific_ctl()

A similar bug was fixed in commit 8ce48623f0cf ("ipv6: tcp: restore
IP6CB for pktoptions skbs"), but I missed another spot.

tcp_v6_syn_recv_sock() can indeed set np->pktoptions from ireq->pktopts

Fixes: 971f10eca186 ("tcp: better TCP_SKB_CB layout to reduce cache line misses")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv6/tcp_ipv6.c