linux-kernel - [PATCH 3.10 02/77] af_iucv: wrong mapping of sent and confirmed skbs

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Message-Id: <20140628174521.822598806@linuxfoundation.org>
Date:	Sat, 28 Jun 2014 10:45:55 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ursula Braun <ursula.braun@...ibm.com>,
	Frank Blaschka <frank.blaschka@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.10 02/77] af_iucv: wrong mapping of sent and confirmed skbs

3.10-stable review patch.  If anyone has any objections, please let me know.

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

From: Ursula Braun <ursula.braun@...ibm.com>

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@...ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@...ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/iucv/af_iucv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -1829,7 +1829,7 @@ static void iucv_callback_txdone(struct
 		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;
 			}

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