From a869981423b96045c49420a6884c72528836cea8 Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Tue, 5 Feb 2008 23:35:04 +0900 Subject: [PATCH] [SCTP]: Fix kernel panic while received ASCONF chunk with bad serial number While recevied ASCONF chunk with serial number less then needed, kernel will treat this chunk as a retransmitted ASCONF chunk and find cached ASCONF-ACK chunk used sctp_assoc_lookup_asconf_ack(). But this function will always return NO-NULL. So response with cached ASCONF-ACKs chunk will cause kernel panic. In function sctp_assoc_lookup_asconf_ack(), if the cached ASCONF-ACKs list asconf_ack_list is empty, or if the serial being requested does not exists, the function as it currectly stands returns the actuall list_head asoc->asconf_ack_list, this is not a cache ASCONF-ACK chunk but a bogus pointer. Signed-off-by: Wei Yongjun Signed-off-by: Vlad Yasevich --- net/sctp/associola.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/sctp/associola.c b/net/sctp/associola.c index 13931a91f667..d29f792e0529 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -1525,7 +1525,7 @@ struct sctp_chunk *sctp_assoc_lookup_asconf_ack( const struct sctp_association *asoc, __be32 serial) { - struct sctp_chunk *ack = NULL; + struct sctp_chunk *ack; /* Walk through the list of cached ASCONF-ACKs and find the * ack chunk whose serial number matches that of the request. @@ -1533,9 +1533,9 @@ struct sctp_chunk *sctp_assoc_lookup_asconf_ack( list_for_each_entry(ack, &asoc->asconf_ack_list, transmitted_list) { if (ack->subh.addip_hdr->serial == serial) { sctp_chunk_hold(ack); - break; + return ack; } } - return ack; + return NULL; }