linux-kernel - [04/11] irda: off by one

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Date:	Sat, 18 Sep 2010 11:45:00 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Dan Carpenter <error27@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [04/11] irda: off by one

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Dan Carpenter <error27@...il.com>

commit cf9b94f88bdbe8a02015fc30d7c232b2d262d4ad upstream.

This is an off by one.  We would go past the end when we NUL terminate
the "value" string at end of the function.  The "value" buffer is
allocated in irlan_client_parse_response() or
irlan_provider_parse_command().

CC: stable@...nel.org
Signed-off-by: Dan Carpenter <error27@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>

---
 net/irda/irlan/irlan_common.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/irda/irlan/irlan_common.c
+++ b/net/irda/irlan/irlan_common.c
@@ -1100,7 +1100,7 @@ int irlan_extract_param(__u8 *buf, char
 	memcpy(&val_len, buf+n, 2); /* To avoid alignment problems */
 	le16_to_cpus(&val_len); n+=2;
 
-	if (val_len > 1016) {
+	if (val_len >= 1016) {
 		IRDA_DEBUG(2, "%s(), parameter length to long\n", __func__ );
 		return -RSP_INVALID_COMMAND_FORMAT;
 	}


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