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sctp: refactor sctp_outq_teardown to insure proper re-initalization 

Jamie Parsons reported a problem recently, in which the re-initalization of an
association (The duplicate init case), resulted in a loss of receive window
space.  He tracked down the root cause to sctp_outq_teardown, which discarded
all the data on an outq during a re-initalization of the corresponding
association, but never reset the outq->outstanding_data field to zero.  I wrote,
and he tested this fix, which does a proper full re-initalization of the outq,
fixing this problem, and hopefully future proofing us from simmilar issues down
the road.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Reported-by: Jamie Parsons <Jamie.Parsons@metaswitch.com>
Tested-by: Jamie Parsons <Jamie.Parsons@metaswitch.com>
CC: Jamie Parsons <Jamie.Parsons@metaswitch.com>
CC: Vlad Yasevich <vyasevich@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: netdev@vger.kernel.org
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman 2013-01-17 11:15:08 +00:00 committed by David S. Miller
parent 01fe944f10
commit 2f94aabd9f
1 changed files with 8 additions and 4 deletions
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12
net/sctp/outqueue.c
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@ -224,7 +224,7 @@ void sctp_outq_init(struct sctp_association *asoc, struct sctp_outq *q)
/* Free the outqueue structure and any related pending chunks.
*/
void sctp_outq_teardown(struct sctp_outq *q)
static void __sctp_outq_teardown(struct sctp_outq *q)
{
struct sctp_transport *transport;
struct list_head *lchunk, *temp;
@ -277,8 +277,6 @@ void sctp_outq_teardown(struct sctp_outq *q)
sctp_chunk_free(chunk);
}
q->error = 0;
/* Throw away any leftover control chunks. */
list_for_each_entry_safe(chunk, tmp, &q->control_chunk_list, list) {
list_del_init(&chunk->list);
@ -286,11 +284,17 @@ void sctp_outq_teardown(struct sctp_outq *q)
}
}
void sctp_outq_teardown(struct sctp_outq *q)
{
__sctp_outq_teardown(q);
sctp_outq_init(q->asoc, q);
}
/* Free the outqueue structure and any related pending chunks. */
void sctp_outq_free(struct sctp_outq *q)
{
/* Throw away leftover chunks. */
sctp_outq_teardown(q);
__sctp_outq_teardown(q);
/* If we were kmalloc()'d, free the memory. */
if (q->malloced)