[3.11.y.z extended stable] Patch "af_iucv: wrong mapping of sent and confirmed skbs" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    af_iucv: wrong mapping of sent and confirmed skbs

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From b2fbc4a6c57c74da0a7de501542446a9e74bd110 Mon Sep 17 00:00:00 2001
From: Ursula Braun <ursula.braun at de.ibm.com>
Date: Tue, 13 May 2014 14:38:02 +0200
Subject: af_iucv: wrong mapping of sent and confirmed skbs

commit f5738e2ef88070ef1372e6e718124d88e9abe4ac upstream.

When sending data through IUCV a MESSAGE COMPLETE interrupt
signals that sent data memory can be freed or reused again.
With commit f9c41a62bba3f3f7ef3541b2a025e3371bcbba97
"af_iucv: fix recvmsg by replacing skb_pull() function" the
MESSAGE COMPLETE callback iucv_callback_txdone() identifies
the wrong skb as being confirmed, which leads to data corruption.
This patch fixes the skb mapping logic in iucv_callback_txdone().

Signed-off-by: Ursula Braun <ursula.braun at de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka at de.ibm.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 net/iucv/af_iucv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index c4b7218058b6..1465363a452b 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1829,7 +1829,7 @@ static void iucv_callback_txdone(struct iucv_path *path,
 		spin_lock_irqsave(&list->lock, flags);

 		while (list_skb != (struct sk_buff *)list) {
-			if (msg->tag != IUCV_SKB_CB(list_skb)->tag) {
+			if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
 				this = list_skb;
 				break;
 			}
--
1.9.1