From 10a43cea7da841cf85a778a1a4d367fb2de7cbce Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Sun, 26 Apr 2009 23:14:42 +0800 Subject: [PATCH] sctp: fix panic when T4-rto timer expire on removed transport If T4-rto timer is expired on a removed transport, kernel panic will occur when we do failure management on that transport. You can reproduce this use the following sequence: Endpoint A Endpoint B (ESTABLISHED) (ESTABLISHED) <----------------- ASCONF (SRC=X) ASCONF -----------------> (Delete IP Address = X) <----------------- ASCONF-ACK (Success Indication) <----------------- ASCONF (T4-rto timer expire) This patch fixed the problem. Signed-off-by: Wei Yongjun Signed-off-by: Vlad Yasevich --- net/sctp/associola.c | 7 +++++++ net/sctp/sm_statefuns.c | 4 +++- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/net/sctp/associola.c b/net/sctp/associola.c index 3be28fed591..8d3aef9d061 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -575,6 +575,13 @@ void sctp_assoc_rm_peer(struct sctp_association *asoc, if (asoc->shutdown_last_sent_to == peer) asoc->shutdown_last_sent_to = NULL; + /* If we remove the transport an ASCONF was last sent to, set it to + * NULL. + */ + if (asoc->addip_last_asconf && + asoc->addip_last_asconf->transport == peer) + asoc->addip_last_asconf->transport = NULL; + asoc->peer.transport_count--; sctp_transport_free(peer); diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 10abc07d42c..7288192f7df 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -5475,7 +5475,9 @@ sctp_disposition_t sctp_sf_t4_timer_expire( * detection on the appropriate destination address as defined in * RFC2960 [5] section 8.1 and 8.2. */ - sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, SCTP_TRANSPORT(transport)); + if (transport) + sctp_add_cmd_sf(commands, SCTP_CMD_STRIKE, + SCTP_TRANSPORT(transport)); /* Reconfig T4 timer and transport. */ sctp_add_cmd_sf(commands, SCTP_CMD_SETUP_T4, SCTP_CHUNK(chunk)); -- 2.11.4.GIT