netdev - [patch] irda: small read beyond end of array in debug code

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Message-ID: <20130227051502.GC22703@longonot.mountain>
Date:	Wed, 27 Feb 2013 08:15:02 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Samuel Ortiz <samuel@...tiz.org>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] irda: small read beyond end of array in debug code

charset comes from skb->data.  It's a number in the 0-255 range.
If we have debugging turned on then this could cause a read beyond
the end of the array.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/irda/iriap.c b/net/irda/iriap.c
index e71e85b..29340a9 100644
--- a/net/irda/iriap.c
+++ b/net/irda/iriap.c
@@ -495,8 +495,11 @@ static void iriap_getvaluebyclass_confirm(struct iriap_cb *self,
 /*		case CS_ISO_8859_9: */
 /*		case CS_UNICODE: */
 		default:
-			IRDA_DEBUG(0, "%s(), charset %s, not supported\n",
-				   __func__, ias_charset_types[charset]);
+			IRDA_DEBUG(0, "%s(), charset [%d] %s, not supported\n",
+				   __func__, charset,
+				   charset < ARRAY_SIZE(ias_charset_types) ?
+					ias_charset_types[charset] :
+					"(unknown)");
 
 			/* Aborting, close connection! */
 			iriap_disconnect_request(self);
--
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