netdev - [patch 2/6] hfc_usb: fix read buffer overflow

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Date:	Fri, 18 Sep 2009 12:53:02 -0700
From:	akpm@...ux-foundation.org
To:	isdn@...ux-pingi.de
Cc:	netdev@...r.kernel.org, akpm@...ux-foundation.org,
	roel.kluin@...il.com
Subject: [patch 2/6] hfc_usb: fix read buffer overflow

From: Roel Kluin <roel.kluin@...il.com>

Check whether index is within bounds before testing the element.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
Cc: Karsten Keil <isdn@...ux-pingi.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/isdn/hisax/hfc_usb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff -puN drivers/isdn/hisax/hfc_usb.c~hfc_usb-fix-read-buffer-overflow drivers/isdn/hisax/hfc_usb.c
--- a/drivers/isdn/hisax/hfc_usb.c~hfc_usb-fix-read-buffer-overflow
+++ a/drivers/isdn/hisax/hfc_usb.c
@@ -817,8 +817,8 @@ collect_rx_frame(usb_fifo * fifo, __u8 *
 	}
 	/* we have a complete hdlc packet */
 	if (finish) {
-		if ((!fifo->skbuff->data[fifo->skbuff->len - 1])
-		    && (fifo->skbuff->len > 3)) {
+		if (fifo->skbuff->len > 3 &&
+				!fifo->skbuff->data[fifo->skbuff->len - 1]) {
 
 			if (fifon == HFCUSB_D_RX) {
 				DBG(HFCUSB_DBG_DCHANNEL,
_
--
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