From: Roel Kluin <roel.kluin@gmail.com>
Date: Wed, 4 Nov 2009 16:31:59 +0000 (-0800)
Subject: isdn: hfc_usb: Fix read buffer overflow
X-Git-Tag: v2.6.32-rc7~58^2~24
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=286e633ef0ff5bb63c07b4516665da8004966fec;p=~shefty%2Frdma-dev.git

isdn: hfc_usb: Fix read buffer overflow

Check whether index is within bounds before testing the element.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Karsten Keil <isdn@linux-pingi.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/isdn/hisax/hfc_usb.c b/drivers/isdn/hisax/hfc_usb.c
index 9de54202c90..a420b64472e 100644
--- a/drivers/isdn/hisax/hfc_usb.c
+++ b/drivers/isdn/hisax/hfc_usb.c
@@ -817,8 +817,8 @@ collect_rx_frame(usb_fifo * fifo, __u8 * data, int len, int finish)
 	}
 	/* 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,