tree a25e9383d5b91d6062aa4770e6a181e9079d0396
parent 43612d7c04f1a4f5e60104143918fcdf018b66ee
author Eric Dumazet <edumazet@google.com> 1416930004 -0800
committer David S. Miller <davem@davemloft.net> 1416943758 -0500

tcp: fix possible NULL dereference in tcp_vX_send_reset()

After commit ca777eff51f7 ("tcp: remove dst refcount false sharing for
prequeue mode") we have to relax check against skb dst in
tcp_v[46]_send_reset() if prequeue dropped the dst.

If a socket is provided, a full lookup was done to find this socket,
so the dst test can be skipped.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=88191
Reported-by: Jaša Bartelj <jasa.bartelj@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Daniel Borkmann <dborkman@redhat.com>
Fixes: ca777eff51f7 ("tcp: remove dst refcount false sharing for prequeue mode")
Signed-off-by: David S. Miller <davem@davemloft.net>