linux-kernel - [78/80] sctp: Do not reset the packet during sctp_packet

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Date:	Fri, 24 Sep 2010 09:25:06 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Vlad Yasevich <vladislav.yasevich@...com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [78/80] sctp: Do not reset the packet during sctp_packet_config().

2.6.35-stable review patch.  If anyone has any objections, please let us know.

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

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: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/sctp/output.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -92,7 +92,6 @@ struct sctp_packet *sctp_packet_config(s
 	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)) {

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