From: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date: Thu, 27 Nov 2014 09:16:15 +0000 (+0100)
Subject: rtnetlink: release net refcnt on error in do_setlink()
X-Git-Tag: v3.17.7~13
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3e66aad18b516bd6c2b317cd8f01537ae59aa957;p=thirdparty%2Fkernel%2Fstable.git

rtnetlink: release net refcnt on error in do_setlink()

[ Upstream commit e0ebde0e131b529fd721b24f62872def5ec3718c ]

rtnl_link_get_net() holds a reference on the 'struct net', we need to release
it in case of error.

CC: Eric W. Biederman <ebiederm@xmission.com>
Fixes: b51642f6d77b ("net: Enable a userns root rtnl calls that are safe for unprivilged users")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index f0493e3b74710..4921b6536ea58 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1495,6 +1495,7 @@ static int do_setlink(const struct sk_buff *skb,
 			goto errout;
 		}
 		if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)) {
+			put_net(net);
 			err = -EPERM;
 			goto errout;
 		}