netdev - [PATCH] can: kvaser_usb: check number of channels returned by HW

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Message-Id: <1392201340-6909-2-git-send-email-mkl@pengutronix.de>
Date:	Wed, 12 Feb 2014 11:35:40 +0100
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, linux-can@...r.kernel.org,
	kernel@...gutronix.de, Olivier Sobrie <olivier@...rie.be>,
	linux-stable <stable@...r.kernel.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH] can: kvaser_usb: check number of channels returned by HW

From: Olivier Sobrie <olivier@...rie.be>

It is needed to check the number of channels returned by the HW because it
cannot be greater than MAX_NET_DEVICES otherwise it will crash.

Signed-off-by: Olivier Sobrie <olivier@...rie.be>
Cc: linux-stable <stable@...r.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/usb/kvaser_usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 6c859bb..e77d110 100644
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -473,6 +473,8 @@ static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
 		return err;
 
 	dev->nchannels = msg.u.cardinfo.nchannels;
+	if (dev->nchannels > MAX_NET_DEVICES)
+		return -EINVAL;
 
 	return 0;
 }
-- 
1.8.5.3

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