diff options
| author | Eric Dumazet <edumazet@google.com> | 2019-02-16 00:36:20 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-23 11:04:25 +0300 |
| commit | 191d1615f20622f3ab0179d5db92ec30aca3340c (patch) | |
| tree | bea91bb9646faaa1ed569670a94532a70f974c9a /net/ipv4 | |
| parent | 2440ee336c4fb6c6e6462f8a73d9951a91b7e795 (diff) | |
| download | linux-191d1615f20622f3ab0179d5db92ec30aca3340c.tar.xz | |
tcp: clear icsk_backoff in tcp_write_queue_purge()
[ Upstream commit 04c03114be82194d4a4858d41dba8e286ad1787c ]
soukjin bae reported a crash in tcp_v4_err() handling
ICMP_DEST_UNREACH after tcp_write_queue_head(sk)
returned a NULL pointer.
Current logic should have prevented this :
if (seq != tp->snd_una || !icsk->icsk_retransmits ||
!icsk->icsk_backoff || fastopen)
break;
Problem is the write queue might have been purged
and icsk_backoff has not been cleared.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: soukjin bae <soukjin.bae@samsung.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/tcp.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index e2a545f3db68..eb6b60691330 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2258,7 +2258,6 @@ int tcp_disconnect(struct sock *sk, int flags) tp->srtt_us = 0; if ((tp->write_seq += tp->max_window + 2) == 0) tp->write_seq = 1; - icsk->icsk_backoff = 0; tp->snd_cwnd = 2; icsk->icsk_probes_out = 0; tp->packets_out = 0; |