netdev - [PATCH] net/{ipv4,ipv6}: Do not put target net if input nsid is invalid

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Message-Id: <20181025191825.23936-1-bjorn@mork.no>
Date:   Thu, 25 Oct 2018 21:18:25 +0200
From:   Bjørn Mork <bjorn@...k.no>
To:     netdev@...r.kernel.org
Cc:     Li RongQing <lirongqing@...du.com>,
        David Miller <davem@...emloft.net>,
        Bjørn Mork <bjorn@...k.no>,
        David Ahern <dsahern@...il.com>
Subject: [PATCH] net/{ipv4,ipv6}: Do not put target net if input nsid is invalid

The cleanup path will put the target net when netnsid is set.  So we must
reset netnsid if the input is invalid.

Fixes: d7e38611b81e ("net/ipv4: Put target net when address dump fails due to bad attributes")
Fixes: 242afaa6968c ("net/ipv6: Put target net when address dump fails due to bad attributes")
Cc: David Ahern <dsahern@...il.com>
Signed-off-by: Bjørn Mork <bjorn@...k.no>
---
 net/ipv4/devinet.c  | 1 +
 net/ipv6/addrconf.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 9250b309c742..a34602ae27de 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1704,6 +1704,7 @@ static int inet_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
 
 			net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
 			if (IS_ERR(net)) {
+				fillargs->netnsid = -1;
 				NL_SET_ERR_MSG(extack, "ipv4: Invalid target network namespace id");
 				return PTR_ERR(net);
 			}
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 7eb09c86fa13..63a808d5af15 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5058,6 +5058,7 @@ static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
 			fillargs->netnsid = nla_get_s32(tb[i]);
 			net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
 			if (IS_ERR(net)) {
+				fillargs->netnsid = -1;
 				NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
 				return PTR_ERR(net);
 			}
-- 
2.11.0