linux-kernel - [PATCH] [9/223] irda: Fix heap memory corruption in iriap.c

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Date:	Mon, 13 Dec 2010 00:45:04 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	samuel@...tiz.org, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: [PATCH] [9/223] irda: Fix heap memory corruption in iriap.c

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Samuel Ortiz <samuel@...tiz.org>

commit 37f9fc452d138dfc4da2ee1ce5ae85094efc3606 upstream.

While parsing the GetValuebyClass command frame, we could potentially write
passed the skb->data pointer.

Reported-by: Ilja Van Sprundel <ivansprundel@...ctive.com>
Signed-off-by: Samuel Ortiz <samuel@...tiz.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 net/irda/iriap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux/net/irda/iriap.c
===================================================================
--- linux.orig/net/irda/iriap.c
+++ linux/net/irda/iriap.c
@@ -502,7 +502,8 @@ static void iriap_getvaluebyclass_confir
 		IRDA_DEBUG(4, "%s(), strlen=%d\n", __func__, value_len);
 
 		/* Make sure the string is null-terminated */
-		fp[n+value_len] = 0x00;
+		if (n + value_len < skb->len)
+			fp[n + value_len] = 0x00;
 		IRDA_DEBUG(4, "Got string %s\n", fp+n);
 
 		/* Will truncate to IAS_MAX_STRING bytes */
--
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