diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-11-13 15:00:46 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-08 07:29:12 -0800 |
| commit | a9ac5b0bfce3f9777aa5e1512e5e605f61c81b3f (patch) | |
| tree | 774b98ed3e355fcf6583083bdd8081f19215cde5 /net | |
| parent | accbc62ee04bb72ee23a96ec10b0a6a2e2260a55 (diff) | |
net-tcp: fix panic in tcp_fastopen_cache_set()
[ Upstream commit dccf76ca6b626c0c4a4e09bb221adee3270ab0ef ]
We had some reports of crashes using TCP fastopen, and Dave Jones
gave a nice stack trace pointing to the error.
Issue is that tcp_get_metrics() should not be called with a NULL dst
Fixes: 1fe4c481ba637 ("net-tcp: Fast Open client - cookie cache")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Dave Jones <davej@redhat.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Tested-by: Dave Jones <davej@fedoraproject.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp_metrics.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index 52f3c6b971d..31071143335 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -659,10 +659,13 @@ void tcp_fastopen_cache_get(struct sock *sk, u16 *mss, void tcp_fastopen_cache_set(struct sock *sk, u16 mss, struct tcp_fastopen_cookie *cookie, bool syn_lost) { + struct dst_entry *dst = __sk_dst_get(sk); struct tcp_metrics_block *tm; + if (!dst) + return; rcu_read_lock(); - tm = tcp_get_metrics(sk, __sk_dst_get(sk), true); + tm = tcp_get_metrics(sk, dst, true); if (tm) { struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen; |