netdev - [patch] isdn: avoid copying too long drvid

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Message-ID: <20111123064345.GB6871@elgon.mountain>
Date:	Wed, 23 Nov 2011 09:43:46 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Karsten Keil <isdn@...ux-pingi.de>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Neil Horman <nhorman@...driver.com>, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] isdn: avoid copying too long drvid

"cfg->drvid" comes from the user so there is a possibility they
didn't NUL terminate properly.

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

diff --git a/drivers/isdn/i4l/isdn_net.c b/drivers/isdn/i4l/isdn_net.c
index 1f73d7f..487d214 100644
--- a/drivers/isdn/i4l/isdn_net.c
+++ b/drivers/isdn/i4l/isdn_net.c
@@ -2756,6 +2756,8 @@ isdn_net_setcfg(isdn_net_ioctl_cfg * cfg)
 			char *c,
 			*e;
 
+			if (strlen(cfg->drvid) >= sizeof(drvid))
+				return -EINVAL;
 			drvidx = -1;
 			chidx = -1;
 			strcpy(drvid, cfg->drvid);
--
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