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 <[EMAIL PROTECTED]>
--- a/net/sctp/associola.c 2008-01-28 20:31:39.000000000 -0500
+++ b/net/sctp/associola.c 2008-01-28 23:45:20.000000000 -0500
@@ -1525,7 +1525,7 @@ struct sctp_chunk *sctp_assoc_lookup_asc
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_asc
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;
}
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