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linux-sg2042
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sctp: fix panic when sending auth chunks 

When we introduced GSO support, if using auth the auth chunk was being
left queued on the packet even after the final segment was generated.
Later on sctp_transmit_packet it calls sctp_packet_reset, which zeroed
the packet len while not accounting for this left-over. This caused more
space to be used the next packet due to the chunk still being queued,
but space which wasn't allocated as its size wasn't accounted.

The fix is to only queue it back when we know that we are going to
generate another segment.

Fixes: 90017accff ("sctp: Add GSO support")
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2016-07-07 09:39:29 -03:00 committed by David S. Miller
parent 09a7636a5b
commit f1533cce60
1 changed files with 15 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
net/sctp/output.c
View File

@ -582,9 +582,7 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
*/
pkt_size -= WORD_ROUND(chunk->skb->len);
if (chunk == packet->auth && !list_empty(&packet->chunk_list))
list_add(&chunk->list, &packet->chunk_list);
else if (!sctp_chunk_is_data(chunk))
if (!sctp_chunk_is_data(chunk) && chunk != packet->auth)
sctp_chunk_free(chunk);
if (!pkt_size)
@ -605,6 +603,18 @@ int sctp_packet_transmit(struct sctp_packet *packet, gfp_t gfp)
(struct sctp_auth_chunk *)auth,
gfp);
if (packet->auth) {
if (!list_empty(&packet->chunk_list)) {
/* We will generate more packets, so re-queue
* auth chunk.
*/
list_add(&chunk->list, &packet->chunk_list);
} else {
sctp_chunk_free(packet->auth);
packet->auth = NULL;
}
}
if (!gso)
break;
@ -735,6 +745,8 @@ err:
}
goto out;
nomem:
if (packet->auth && list_empty(&packet->auth->list))
sctp_chunk_free(packet->auth);
err = -ENOMEM;
goto err;
}