Patch "tun: allow positive return values on dev_get_valid_name() call" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    tun: allow positive return values on dev_get_valid_name() call

to the 4.9-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:
     tun-allow-positive-return-values-on-dev_get_valid_name-call.patch
and it can be found in the queue-4.9 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 Wed Nov 15 17:24:03 CET 2017
From: Julien Gomes <julien@arista.com>
Date: Wed, 25 Oct 2017 11:50:50 -0700
Subject: tun: allow positive return values on dev_get_valid_name() call

From: Julien Gomes <julien@arista.com>


[ Upstream commit 5c25f65fd1e42685f7ccd80e0621829c105785d9 ]

If the name argument of dev_get_valid_name() contains "%d", it will try
to assign it a unit number in __dev__alloc_name() and return either the
unit number (>= 0) or an error code (< 0).
Considering positive values as error values prevent tun device creations
relying this mechanism, therefor we should only consider negative values
as errors here.

Signed-off-by: Julien Gomes <julien@arista.com>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/tun.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1788,7 +1788,7 @@ static int tun_set_iff(struct net *net,
 		if (!dev)
 			return -ENOMEM;
 		err = dev_get_valid_name(net, dev, name);
-		if (err)
+		if (err < 0)
 			goto err_free_dev;
 
 		dev_net_set(dev, net);


Patches currently in stable-queue which might be from julien@arista.com are

queue-4.9/tun-allow-positive-return-values-on-dev_get_valid_name-call.patch