Patch "net: fool proof dev_valid_name()" has been added to the 4.15-stable tree

Patch "net: fool proof dev_valid_name()" has been added to the 4.15-stable tree

[gregkh]

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

    net: fool proof dev_valid_name()

to the 4.15-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:
     net-fool-proof-dev_valid_name.patch
and it can be found in the queue-4.15 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 23:19:36 CEST 2018
From: Eric Dumazet <edumazet@google.com>
Date: Thu, 5 Apr 2018 06:39:26 -0700
Subject: net: fool proof dev_valid_name()

From: Eric Dumazet <edumazet@google.com>


[ Upstream commit a9d48205d0aedda021fc3728972a9e9934c2b9de ]

We want to use dev_valid_name() to validate tunnel names,
so better use strnlen(name, IFNAMSIZ) than strlen(name) to make
sure to not upset KASAN.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/core/dev.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1027,7 +1027,7 @@ bool dev_valid_name(const char *name)
 {
 	if (*name == '\0')
 		return false;
-	if (strlen(name) >= IFNAMSIZ)
+	if (strnlen(name, IFNAMSIZ) == IFNAMSIZ)
 		return false;
 	if (!strcmp(name, ".") || !strcmp(name, ".."))
 		return false;


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

queue-4.15/sctp-sctp_sockaddr_af-must-check-minimal-addr-length-for-af_inet6.patch
queue-4.15/net-fix-possible-out-of-bound-read-in-skb_network_protocol.patch
queue-4.15/pptp-remove-a-buggy-dst-release-in-pptp_connect.patch
queue-4.15/net-fool-proof-dev_valid_name.patch
queue-4.15/ipv6-the-entire-ipv6-header-chain-must-fit-the-first-fragment.patch
queue-4.15/vti6-better-validate-user-provided-tunnel-names.patch
queue-4.15/ipv6-sit-better-validate-user-provided-tunnel-names.patch
queue-4.15/ip6_tunnel-better-validate-user-provided-tunnel-names.patch
queue-4.15/sctp-do-not-leak-kernel-memory-to-user-space.patch
queue-4.15/ip_tunnel-better-validate-user-provided-tunnel-names.patch
queue-4.15/netlink-make-sure-nladdr-has-correct-size-in-netlink_connect.patch
queue-4.15/ip6_gre-better-validate-user-provided-tunnel-names.patch