linux-kernel - [34-longterm 151/260] sctp: Do not reset the packet during sctp_packet

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Message-Id: <1293952756-15010-152-git-send-email-paul.gortmaker@windriver.com>
Date:	Sun,  2 Jan 2011 02:17:27 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org,
	Vlad Yasevich <vladislav.yasevich@...com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 151/260] sctp: Do not reset the packet during sctp_packet_config().

From: Vlad Yasevich <vladislav.yasevich@...com>

commit 4bdab43323b459900578b200a4b8cf9713ac8fab upstream.

sctp_packet_config() is called when getting the packet ready
for appending of chunks.  The function should not touch the
current state, since it's possible to ping-pong between two
transports when sending, and that can result packet corruption
followed by skb overlfow crash.

Reported-by: Thomas Dreibholz <dreibh@....uni-due.de>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@...com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 net/sctp/output.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/net/sctp/output.c b/net/sctp/output.c
index fad261d..5468d41 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -92,7 +92,6 @@ struct sctp_packet *sctp_packet_config(struct sctp_packet *packet,
 	SCTP_DEBUG_PRINTK("%s: packet:%p vtag:0x%x\n", __func__,
 			  packet, vtag);
 
-	sctp_packet_reset(packet);
 	packet->vtag = vtag;
 
 	if (ecn_capable && sctp_packet_empty(packet)) {
-- 
1.7.3.3

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