tun: use sk_fullsock() before reading sk->sk_tsflags
authorEric Dumazet <edumazet@google.com>
Fri, 9 Oct 2015 22:42:21 +0000 (15:42 -0700)
committerDavid S. Miller <davem@davemloft.net>
Tue, 13 Oct 2015 02:45:48 +0000 (19:45 -0700)
commit5fcd2d8be43664f1b6a5add3d21a367411add9d4
tree3cc46ec8ea75d7ddfed640d2be9b33f1aa80fce7
parentb7a4609591612119869f2498732da98e4f8d5f4d
tun: use sk_fullsock() before reading sk->sk_tsflags

timewait or request sockets are small and do not contain sk->sk_tsflags

Without this fix, we might read garbage, and crash later in

__skb_complete_tx_timestamp()
 -> sock_queue_err_skb()

(These pseudo sockets do not have an error queue either)

Fixes: ca6fb0651883 ("tcp: attach SYNACK messages to request sockets instead of listener")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/tun.c