Patch "vti6: better validate user provided tunnel names" has been added to the 4.14-stable tree

Patch "vti6: better validate user provided tunnel names" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    vti6: better validate user provided tunnel names

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vti6-better-validate-user-provided-tunnel-names.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Tue Apr 10 23:20:08 CEST 2018
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 5 Apr 2018 06:39:31 -0700
Subject: vti6: better validate user provided tunnel names

From: Eric Dumazet <edumazet@google.com>


[ Upstream commit 537b361fbcbcc3cd6fe2bb47069fd292b9256d16 ]

Use valid_name() to make sure user does not provide illegal
device name.

Fixes: ed1efb2aefbb ("ipv6: Add support for IPsec virtual tunnel interfaces")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv6/ip6_vti.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -212,10 +212,13 @@ static struct ip6_tnl *vti6_tnl_create(s
 	char name[IFNAMSIZ];
 	int err;
 
-	if (p->name[0])
+	if (p->name[0]) {
+		if (!dev_valid_name(p->name))
+			goto failed;
 		strlcpy(name, p->name, IFNAMSIZ);
-	else
+	} else {
 		sprintf(name, "ip6_vti%%d");
+	}
 
 	dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN, vti6_dev_setup);
 	if (!dev)


Patches currently in stable-queue which might be from edumazet@google.com are

queue-4.14/sctp-sctp_sockaddr_af-must-check-minimal-addr-length-for-af_inet6.patch
queue-4.14/net-fix-possible-out-of-bound-read-in-skb_network_protocol.patch
queue-4.14/pptp-remove-a-buggy-dst-release-in-pptp_connect.patch
queue-4.14/net-fool-proof-dev_valid_name.patch
queue-4.14/ipv6-the-entire-ipv6-header-chain-must-fit-the-first-fragment.patch
queue-4.14/vti6-better-validate-user-provided-tunnel-names.patch
queue-4.14/ipv6-sit-better-validate-user-provided-tunnel-names.patch
queue-4.14/ip6_tunnel-better-validate-user-provided-tunnel-names.patch
queue-4.14/sctp-do-not-leak-kernel-memory-to-user-space.patch
queue-4.14/ip_tunnel-better-validate-user-provided-tunnel-names.patch
queue-4.14/netlink-make-sure-nladdr-has-correct-size-in-netlink_connect.patch
queue-4.14/ip6_gre-better-validate-user-provided-tunnel-names.patch