diff options
| author | Eric Dumazet <edumazet@google.com> | 2014-11-25 18:40:04 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-25 22:29:18 +0300 |
| commit | c3658e8d0f10147fc86018be7f11668246c156d3 (patch) | |
| tree | a25e9383d5b91d6062aa4770e6a181e9079d0396 /net/ipv6/tcp_ipv6.c | |
| parent | 43612d7c04f1a4f5e60104143918fcdf018b66ee (diff) | |
| download | linux-c3658e8d0f10147fc86018be7f11668246c156d3.tar.xz | |
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>
Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index ace29b60813c..dc495ae2ead0 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -903,7 +903,10 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) if (th->rst) return; - if (!ipv6_unicast_destination(skb)) + /* If sk not NULL, it means we did a successful lookup and incoming + * route had to be correct. prequeue might have dropped our dst. + */ + if (!sk && !ipv6_unicast_destination(skb)) return; #ifdef CONFIG_TCP_MD5SIG |