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authorDaniel Borkmann <dborkman@redhat.com>2013-10-31 09:13:32 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-20 12:31:37 -0800
commite697716658d52d072707f0aade1ccf8742c5fa60 (patch)
treecbedfc7dc758d2818f5a43cd3ea3fb3fa3b418c1 /net
parent51ce60929df54a8daa310091743458c95d95633f (diff)
net: sctp: do not trigger BUG_ON in sctp_cmd_delete_tcb
[ Upstream commit 7926c1d5be0b7cbe5b8d5c788d7d39237e7b212c ] Introduced in f9e42b853523 ("net: sctp: sideeffect: throw BUG if primary_path is NULL"), we intended to find a buggy assoc that's part of the assoc hash table with a primary_path that is NULL. However, we better remove the BUG_ON for now and find a more suitable place to assert for these things as Mark reports that this also triggers the bug when duplication cookie processing happens, and the assoc is not part of the hash table (so all good in this case). Such a situation can for example easily be reproduced by: tc qdisc add dev eth0 root handle 1: prio bands 2 priomap 1 1 1 1 1 1 tc qdisc add dev eth0 parent 1:2 handle 20: netem loss 20% tc filter add dev eth0 protocol ip parent 1: prio 2 u32 match ip \ protocol 132 0xff match u8 0x0b 0xff at 32 flowid 1:2 This drops 20% of COOKIE-ACK packets. After some follow-up discussion with Vlad we came to the conclusion that for now we should still better remove this BUG_ON() assertion, and come up with two follow-ups later on, that is, i) find a more suitable place for this assertion, and possibly ii) have a special allocator/initializer for such kind of temporary assocs. Reported-by: Mark Thomas <Mark.Thomas@metaswitch.com> Signed-off-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> 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/sctp/sm_sideeffect.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 9da68852ee94..8b5b4b7b9941 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -866,7 +866,6 @@ static void sctp_cmd_delete_tcb(sctp_cmd_seq_t *cmds,
(!asoc->temp) && (sk->sk_shutdown != SHUTDOWN_MASK))
return;
- BUG_ON(asoc->peer.primary_path == NULL);
sctp_unhash_established(asoc);
sctp_association_free(asoc);
}