netdev - [PATCH net-next 3/5] irda: Test index before read in stir421x_patch

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Date:	Mon, 11 Oct 2010 02:25:00 +0200
From:	Samuel Ortiz <samuel@...tiz.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Roel Kluin <roel.kluin@...il.com>,
	Samuel Ortiz <samuel@...tiz.org>
Subject: [PATCH net-next 3/5] irda: Test index before read in stir421x_patch_device()

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

Test whether index exceeds fw->size before reading the element

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
Signed-off-by: Samuel Ortiz <samuel@...tiz.org>
---
 drivers/net/irda/irda-usb.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/irda/irda-usb.c b/drivers/net/irda/irda-usb.c
index cce82f1..e4ea619 100644
--- a/drivers/net/irda/irda-usb.c
+++ b/drivers/net/irda/irda-usb.c
@@ -1124,11 +1124,11 @@ static int stir421x_patch_device(struct irda_usb_cb *self)
                  * The actual image starts after the "STMP" keyword
                  * so forward to the firmware header tag
                  */
-                for (i = 0; (fw->data[i] != STIR421X_PATCH_END_OF_HDR_TAG) &&
-			     (i < fw->size); i++) ;
+                for (i = 0; i < fw->size && fw->data[i] !=
+			     STIR421X_PATCH_END_OF_HDR_TAG; i++) ;
                 /* here we check for the out of buffer case */
-                if ((STIR421X_PATCH_END_OF_HDR_TAG == fw->data[i]) &&
-                    (i < STIR421X_PATCH_CODE_OFFSET)) {
+                if (i < STIR421X_PATCH_CODE_OFFSET && i < fw->size &&
+				STIR421X_PATCH_END_OF_HDR_TAG == fw->data[i]) {
                         if (!memcmp(fw->data + i + 1, STIR421X_PATCH_STMP_TAG,
                                     sizeof(STIR421X_PATCH_STMP_TAG) - 1)) {
 
-- 
1.7.1

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