linux-kernel - [010/121] sctp: fully initialize sctp_outq in sctp_outq

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Message-ID: <lsq.1378608721.251863536@decadent.org.uk>
Date:	Sun, 08 Sep 2013 03:52:01 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, davem@...emloft.net,
	"Vlad Yasevich" <vyasevich@...il.com>,
	"Neil Horman" <nhorman@...driver.com>, netdev@...r.kernel.org,
	"West, Steve (NSN - US/Fort Worth)" <steve.west@....com>
Subject: [010/121] sctp: fully initialize sctp_outq in sctp_outq_init

3.2.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Neil Horman <nhorman@...driver.com>

[ Upstream commit c5c7774d7eb4397891edca9ebdf750ba90977a69 ]

In commit 2f94aabd9f6c925d77aecb3ff020f1cc12ed8f86
(refactor sctp_outq_teardown to insure proper re-initalization)
we modified sctp_outq_teardown to use sctp_outq_init to fully re-initalize the
outq structure.  Steve West recently asked me why I removed the q->error = 0
initalization from sctp_outq_teardown.  I did so because I was operating under
the impression that sctp_outq_init would properly initalize that value for us,
but it doesn't.  sctp_outq_init operates under the assumption that the outq
struct is all 0's (as it is when called from sctp_association_init), but using
it in __sctp_outq_teardown violates that assumption. We should do a memset in
sctp_outq_init to ensure that the entire structure is in a known state there
instead.

Signed-off-by: Neil Horman <nhorman@...driver.com>
Reported-by: "West, Steve (NSN - US/Fort Worth)" <steve.west@....com>
CC: Vlad Yasevich <vyasevich@...il.com>
CC: netdev@...r.kernel.org
CC: davem@...emloft.net
Acked-by: Vlad Yasevich <vyasevich@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/sctp/outqueue.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 96eb168..3dd7207 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -205,6 +205,8 @@ static inline int sctp_cacc_skip(struct sctp_transport *primary,
  */
 void sctp_outq_init(struct sctp_association *asoc, struct sctp_outq *q)
 {
+	memset(q, 0, sizeof(struct sctp_outq));
+
 	q->asoc = asoc;
 	INIT_LIST_HEAD(&q->out_chunk_list);
 	INIT_LIST_HEAD(&q->control_chunk_list);
@@ -212,13 +214,7 @@ void sctp_outq_init(struct sctp_association *asoc, struct sctp_outq *q)
 	INIT_LIST_HEAD(&q->sacked);
 	INIT_LIST_HEAD(&q->abandoned);

-	q->fast_rtx = 0;
-	q->outstanding_bytes = 0;
 	q->empty = 1;
-	q->cork  = 0;
-
-	q->malloced = 0;
-	q->out_qlen = 0;
 }

 /* Free the outqueue structure and any related pending chunks.

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