From: Ursula Braun <ursula.braun@de.ibm.com>
Date: Tue, 13 May 2014 12:38:02 +0000 (+0200)
Subject: af_iucv: wrong mapping of sent and confirmed skbs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f6e39ac6156b2b46584d2dbbd4c2ead95e883552;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

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

diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 276aa86f366b..215e9b008db6 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;
 			}