netdev - [PATCH net] devlink: fix netns refcount leak in devlink_nl_cmd

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Message-Id: <20211205192822.1741045-1-eric.dumazet@gmail.com>
Date:   Sun,  5 Dec 2021 11:28:22 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Moshe Shemesh <moshe@...lanox.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Jiri Pirko <jiri@...dia.com>
Subject: [PATCH net] devlink: fix netns refcount leak in devlink_nl_cmd_reload()

From: Eric Dumazet <edumazet@...gle.com>

While preparing my patch series adding netns refcount tracking,
I spotted bugs in devlink_nl_cmd_reload()

Some error paths forgot to release a refcount on a netns.

To fix this, we can reduce the scope of get_net()/put_net()
section around the call to devlink_reload().

Fixes: ccdf07219da6 ("devlink: Add reload action option to devlink reload command")
Fixes: dc64cc7c6310 ("devlink: Add devlink reload limit option")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Moshe Shemesh <moshe@...lanox.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Jacob Keller <jacob.e.keller@...el.com>
Cc: Jiri Pirko <jiri@...dia.com>
---
 net/core/devlink.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 5ad72dbfcd0797ae045734b83fbbdc090ae3ff53..c06c9ba6e8c5ea00a3999700a6724a404c1f05f9 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -4110,14 +4110,6 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
 		return err;
 	}
 
-	if (info->attrs[DEVLINK_ATTR_NETNS_PID] ||
-	    info->attrs[DEVLINK_ATTR_NETNS_FD] ||
-	    info->attrs[DEVLINK_ATTR_NETNS_ID]) {
-		dest_net = devlink_netns_get(skb, info);
-		if (IS_ERR(dest_net))
-			return PTR_ERR(dest_net);
-	}
-
 	if (info->attrs[DEVLINK_ATTR_RELOAD_ACTION])
 		action = nla_get_u8(info->attrs[DEVLINK_ATTR_RELOAD_ACTION]);
 	else
@@ -4160,6 +4152,14 @@ static int devlink_nl_cmd_reload(struct sk_buff *skb, struct genl_info *info)
 			return -EINVAL;
 		}
 	}
+	if (info->attrs[DEVLINK_ATTR_NETNS_PID] ||
+	    info->attrs[DEVLINK_ATTR_NETNS_FD] ||
+	    info->attrs[DEVLINK_ATTR_NETNS_ID]) {
+		dest_net = devlink_netns_get(skb, info);
+		if (IS_ERR(dest_net))
+			return PTR_ERR(dest_net);
+	}
+
 	err = devlink_reload(devlink, dest_net, action, limit, &actions_performed, info->extack);
 
 	if (dest_net)
-- 
2.34.1.400.ga245620fadb-goog