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[SCTP]: Fix potential race condition between sctp_close() and sctp_rcv(). 

Do not release the reference to association/endpoint if an incoming skb is
added to backlog. Instead release it after the chunk is processed in
sctp_backlog_rcv().

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
This commit is contained in:
Sridhar Samudrala 2006-01-17 11:51:28 -08:00
parent 2664b25051
commit 7a48f923b8
2 changed files with 22 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
net/sctp/input.c
View File

@ -262,15 +262,12 @@ int sctp_rcv(struct sk_buff *skb)
else
sctp_backlog_rcv(sk, skb);
/* Release the sock and any reference counts we took in the
* lookup calls.
/* Release the sock and the sock ref we took in the lookup calls.
* The asoc/ep ref will be released in sctp_backlog_rcv.
*/
sctp_bh_unlock_sock(sk);
if (asoc)
sctp_association_put(asoc);
else
sctp_endpoint_put(ep);
sock_put(sk);
return ret;
discard_it:
@ -296,9 +293,23 @@ discard_release:
int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;
struct sctp_inq *inqueue = &chunk->rcvr->inqueue;
struct sctp_inq *inqueue = NULL;
struct sctp_ep_common *rcvr = NULL;
sctp_inq_push(inqueue, chunk);
rcvr = chunk->rcvr;
if (rcvr->dead) {
sctp_chunk_free(chunk);
} else {
inqueue = &chunk->rcvr->inqueue;
sctp_inq_push(inqueue, chunk);
}
/* Release the asoc/ep ref we took in the lookup calls in sctp_rcv. */
if (SCTP_EP_TYPE_ASSOCIATION == rcvr->type)
sctp_association_put(sctp_assoc(rcvr));
else
sctp_endpoint_put(sctp_ep(rcvr));
return 0;
}

4
net/sctp/inqueue.c
View File

@ -73,8 +73,10 @@ void sctp_inq_free(struct sctp_inq *queue)
/* If there is a packet which is currently being worked on,
* free it as well.
*/
if (queue->in_progress)
if (queue->in_progress) {
sctp_chunk_free(queue->in_progress);
queue->in_progress = NULL;
}
if (queue->malloced) {
/* Dump the master memory segment. */