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authorWei Yongjun2008-02-05 23:35:04 +0900
committerVlad Yasevich2008-02-06 21:27:39 -0500
commita869981423b96045c49420a6884c72528836cea8 (patch)
treef8f97758febdd52e19bc4c27c566a9ba3027e359 /net
parentb46ae36de451212d253f31112338517753739191 (diff)
[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 <yjwei@cn.fujitsu.com> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Diffstat (limited to 'net')
-rw-r--r--net/sctp/associola.c6
1 files 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;
}