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| author | Eric Dumazet <edumazet@google.com> | 2013-11-13 15:00:46 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-11-14 16:33:18 -0500 |
| commit | dccf76ca6b626c0c4a4e09bb221adee3270ab0ef (patch) | |
| tree | 655cb86c3c54d9b5ac9cb05f632bf0cd16077a4a /net/ipv4/tcp_metrics.c | |
| parent | b869ccfab1e324507fa3596e3e1308444fb68227 (diff) | |
| download | linux-stable-dccf76ca6b626c0c4a4e09bb221adee3270ab0ef.tar.gz linux-stable-dccf76ca6b626c0c4a4e09bb221adee3270ab0ef.tar.bz2 linux-stable-dccf76ca6b626c0c4a4e09bb221adee3270ab0ef.zip | |
net-tcp: fix panic in tcp_fastopen_cache_set()
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>
Diffstat (limited to 'net/ipv4/tcp_metrics.c')
| -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 2ab09cbae74d..d3ee2e0c28b6 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -663,10 +663,13 @@ 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; |