diff options
| author | Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> | 2010-07-19 01:16:18 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-02 10:20:53 -0700 |
| commit | dc6330590fbd5fad17f06663c5f0bed834054b2b (patch) | |
| tree | c9509ba42aa68e848808152e40a90f48359df22d /net | |
| parent | d7091c2bbded22430db06e5172a3b4c3ee7f3cd8 (diff) | |
tcp: fix crash in tcp_xmit_retransmit_queue
commit 45e77d314585869dfe43c82679f7e08c9b35b898 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to '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 fcd278a7080..af83bdf559d 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2037,6 +2037,9 @@ 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; |