linux-kernel - [PATCH] gigaset: correct range checking off by one error

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Message-Id: <20100316172048.CBC5240116@xenon.ts.pxnet.com>
Date:	Tue, 16 Mar 2010 18:04:01 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Karsten Keil <isdn@...ux-pingi.de>,
	David Miller <davem@...emloft.net>
CC:	Dan Carpenter <error27@...il.com>, Hansjoerg Lipp <hjlipp@....de>,
	isdn4linux <isdn4linux@...tserv.isdn4linux.de>,
	i4ldeveloper <i4ldeveloper@...tserv.isdn4linux.de>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: [PATCH] gigaset: correct range checking off by one error

Correct a potential array overrun due to an off by one error in the
range check on the CAPI CONNECT_REQ CIPValue parameter.
Found and reported by Dan Carpenter using smatch.

Impact: bugfix
Signed-off-by: Tilman Schmidt <tilman@...p.cc>
---
 drivers/isdn/gigaset/capi.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/isdn/gigaset/capi.c b/drivers/isdn/gigaset/capi.c
index 4a31962..0220c19 100644
--- a/drivers/isdn/gigaset/capi.c
+++ b/drivers/isdn/gigaset/capi.c
@@ -1301,7 +1301,7 @@ static void do_connect_req(struct gigaset_capi_ctr *iif,
 	}
 
 	/* check parameter: CIP Value */
-	if (cmsg->CIPValue > ARRAY_SIZE(cip2bchlc) ||
+	if (cmsg->CIPValue >= ARRAY_SIZE(cip2bchlc) ||
 	    (cmsg->CIPValue > 0 && cip2bchlc[cmsg->CIPValue].bc == NULL)) {
 		dev_notice(cs->dev, "%s: unknown CIP value %d\n",
 			   "CONNECT_REQ", cmsg->CIPValue);
-- 
1.6.5.3.298.g39add

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