linux-kernel - [PATCH 3.9-table] NTB: fix pointer math issues

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Date:	Sat, 18 May 2013 11:39:05 +0900
From:	Jonghwan Choi <jhbird.choi@...il.com>
To:	Jon Mason <jon.mason@...el.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	stable@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: [PATCH 3.9-table] NTB: fix pointer math issues

From: Dan Carpenter <dan.carpenter@...cle.com>

This patch looks like it should be in the 3.9-stable tree, should we apply
it?

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

From: "Dan Carpenter <dan.carpenter@...cle.com>"

commit cc0f868d8adef7bdc12cda132654870086d766bc upstream

->remote_rx_info and ->rx_info are struct ntb_rx_info pointers.  If we
add sizeof(struct ntb_rx_info) then it goes too far.

Cc: <stable@...r.kernel.org> # 3.9.x: ad3e2751: ntb: off by one
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Jon Mason <jon.mason@...el.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
---
 drivers/ntb/ntb_transport.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index e0bdfd7..676ee16 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -486,7 +486,7 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
 			     (qp_num / NTB_NUM_MW * rx_size);
 	rx_size -= sizeof(struct ntb_rx_info);
 
-	qp->rx_buff = qp->remote_rx_info + sizeof(struct ntb_rx_info);
+	qp->rx_buff = qp->remote_rx_info + 1;
 	qp->rx_max_frame = min(transport_mtu, rx_size);
 	qp->rx_max_entry = rx_size / qp->rx_max_frame;
 	qp->rx_index = 0;
@@ -780,7 +780,7 @@ static void ntb_transport_init_queue(struct ntb_transport *nt,
 		      (qp_num / NTB_NUM_MW * tx_size);
 	tx_size -= sizeof(struct ntb_rx_info);
 
-	qp->tx_mw = qp->rx_info + sizeof(struct ntb_rx_info);
+	qp->tx_mw = qp->rx_info + 1;
 	qp->tx_max_frame = min(transport_mtu, tx_size);
 	qp->tx_max_entry = tx_size / qp->tx_max_frame;
 	qp->tx_index = 0;
-- 
1.8.1.2

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