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| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2010-07-19 01:16:18 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-07-19 12:43:49 -0700 |
| commit | 45e77d314585869dfe43c82679f7e08c9b35b898 (patch) | |
| tree | 73c6322600e47a44a8c171abff392a61eac53be9 | |
| parent | b508998f665ee6d6a15eae11be258c3e94c33562 (diff) | |
| download | linux-3.10-45e77d314585869dfe43c82679f7e08c9b35b898.tar.gz linux-3.10-45e77d314585869dfe43c82679f7e08c9b35b898.tar.bz2 linux-3.10-45e77d314585869dfe43c82679f7e08c9b35b898.zip | |
tcp: fix crash in tcp_xmit_retransmit_queue
It can happen that there are no packets in queue while calling
tcp_xmit_retransmit_queue(). tcp_write_queue_head() then returns
NULL and that gets deref'ed to get sacked into a local var.
There is no work to do if no packets are outstanding so we just
exit early.
This oops was introduced by 08ebd1721ab8fd (tcp: remove tp->lost_out
guard to make joining diff nicer).
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Reported-by: Lennart Schulte <lennart.schulte@nets.rwth-aachen.de>
Tested-by: Lennart Schulte <lennart.schulte@nets.rwth-aachen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/tcp_output.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index b4ed957f201..7ed9dc1042d 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2208,6 +2208,9 @@ void tcp_xmit_retransmit_queue(struct sock *sk) int mib_idx; int fwd_rexmitting = 0; + if (!tp->packets_out) + return; + if (!tp->lost_out) tp->retransmit_high = tp->snd_una; |