netdev - [PATCH net-next 5/5] irda: Fix heap memory corruption in iriap.c

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Message-Id: <37f9fc452d138dfc4da2ee1ce5ae85094efc3606.1286756123.git.sameo@linux.intel.com>
Date:	Mon, 11 Oct 2010 02:25:02 +0200
From:	Samuel Ortiz <samuel@...tiz.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, Samuel Ortiz <samuel@...tiz.org>,
	stable@...nel.org
Subject: [PATCH net-next 5/5] irda: Fix heap memory corruption in iriap.c

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

Cc: stable@...nel.org
Reported-by: Ilja Van Sprundel <ivansprundel@...ctive.com>
Signed-off-by: Samuel Ortiz <samuel@...tiz.org>
---
 net/irda/iriap.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/irda/iriap.c b/net/irda/iriap.c
index fce364c..5b743bd 100644
--- a/net/irda/iriap.c
+++ b/net/irda/iriap.c
@@ -502,7 +502,8 @@ static void iriap_getvaluebyclass_confirm(struct iriap_cb *self,
 		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 */
-- 
1.7.1

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