netdev - [PATCH net-next] ip_tunnel: Fix off-by-one error in forming dev name.

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Message-Id: <1364494906-9818-1-git-send-email-pshelar@nicira.com>
Date:	Thu, 28 Mar 2013 11:21:46 -0700
From:	Pravin B Shelar <pshelar@...ira.com>
To:	netdev@...r.kernel.org
Cc:	Pravin B Shelar <pshelar@...ira.com>,
	Ben Hutchings <bhutchings@...arflare.com>
Subject: [PATCH net-next] ip_tunnel: Fix off-by-one error in forming dev name.

As Ben pointed out following patch fixes bug in checking device
name length limits while forming tunnel device name.

CC: Ben Hutchings <bhutchings@...arflare.com>
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
 net/ipv4/ip_tunnel.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 9d96b68..e4147ec 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -284,7 +284,7 @@ static struct net_device *__ip_tunnel_create(struct net *net,
 	if (parms->name[0])
 		strlcpy(name, parms->name, IFNAMSIZ);
 	else {
-		if (strlen(ops->kind) + 3 >= IFNAMSIZ) {
+		if (strlen(ops->kind) > (IFNAMSIZ - 3)) {
 			err = -E2BIG;
 			goto failed;
 		}
-- 
1.7.1

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