netdev - [patch] netrom: check that user string is terminated

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Message-ID: <20111123065240.GD6871@elgon.mountain>
Date:	Wed, 23 Nov 2011 09:52:40 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-hams@...r.kernel.org, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] netrom: check that user string is terminated

We do an strcpy() of mnemonic in nr_add_node().

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

diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c
index 915a87b..e126c48 100644
--- a/net/netrom/nr_route.c
+++ b/net/netrom/nr_route.c
@@ -670,6 +670,8 @@ int nr_rt_ioctl(unsigned int cmd, void __user *arg)
 	case SIOCADDRT:
 		if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct)))
 			return -EFAULT;
+		if (strlen(nr_route.mnemonic) >= sizeof(nr_route.mnemonic))
+			return -EINVAL;
 		if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL)
 			return -EINVAL;
 		if (nr_route.ndigis < 0 || nr_route.ndigis > AX25_MAX_DIGIS) {
--
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