ip_tunnel: Fix name string concatenate in __ip_tunnel_create()

commit 000ade8016400d93b4d7c89970d96b8c14773d45 upstream.

By passing a limit of 2 bytes to strncat, strncat is limited to writing
fewer bytes than what it's supposed to append to the name here.

Since the bounds are checked on the line above this, just remove the string
bounds checks entirely since they're unneeded.

Signed-off-by: Sultan Alsawaf <sultanxda@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index d3513930372ec0d29f5e3a919cd2c992417bc7dd..2e5b18ad05a365169da834aff3f5c35194c778b6 100644 (file)
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -310,8 +310,8 @@ static struct net_device *__ip_tunnel_create(struct net *net,
        } else {
                if (strlen(ops->kind) > (IFNAMSIZ - 3))
                        goto failed;
-               strlcpy(name, ops->kind, IFNAMSIZ);
-               strncat(name, "%d", 2);
+               strcpy(name, ops->kind);
+               strcat(name, "%d");
        }
 
        ASSERT_RTNL();