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sctp: fix the issue sctp requeue auth chunk incorrectly

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sctp needs to queue auth chunk back when we know that we are going
to generate another segment. But commit f1533cce60 ("sctp: fix
panic when sending auth chunks") requeues the last chunk processed
which is probably not the auth chunk.

It causes panic when calculating the MAC in sctp_auth_calculate_hmac(),
as the incorrect offset of the auth chunk in skb->data.

This fix is to requeue it by using packet->auth.

Fixes: f1533cce60 ("sctp: fix panic when sending auth chunks")
Signed-off-by: Xin Long <[email protected]>
Acked-by: Marcelo Ricardo Leitner <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Xin Long 2016-07-30 13:58:35 +08:00 • committed by David S. Miller
commit 1aa25ec227
1 changed files with 2 additions and 1 deletions
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3
net/sctp/output.c
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@ -610,7 +610,8 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
/* We will generate more packets, so re-queue
* auth chunk.
*/
list_add(&chunk->list, &packet->chunk_list);
list_add(&packet->auth->list,
&packet->chunk_list);
} else {
sctp_chunk_free(packet->auth);
packet->auth = NULL;