linux-kernel - [PATCH 4.9 31/48] rtnetlink: make sure to refresh master_dev/m_ops in __rtnl

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Date:   Mon,  7 Feb 2022 12:06:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Jiri Pirko <jiri@...dia.com>, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 4.9 31/48] rtnetlink: make sure to refresh master_dev/m_ops in __rtnl_newlink()

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

commit c6f6f2444bdbe0079e41914a35081530d0409963 upstream.

While looking at one unrelated syzbot bug, I found the replay logic
in __rtnl_newlink() to potentially trigger use-after-free.

It is better to clear master_dev and m_ops inside the loop,
in case we have to replay it.

Fixes: ba7d49b1f0f8 ("rtnetlink: provide api for getting and setting slave info")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Jiri Pirko <jiri@...dia.com>
Link: https://lore.kernel.org/r/20220201012106.216495-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/rtnetlink.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2454,9 +2454,9 @@ static int rtnl_newlink(struct sk_buff *
 {
 	struct net *net = sock_net(skb->sk);
 	const struct rtnl_link_ops *ops;
-	const struct rtnl_link_ops *m_ops = NULL;
+	const struct rtnl_link_ops *m_ops;
 	struct net_device *dev;
-	struct net_device *master_dev = NULL;
+	struct net_device *master_dev;
 	struct ifinfomsg *ifm;
 	char kind[MODULE_NAME_LEN];
 	char ifname[IFNAMSIZ];
@@ -2487,6 +2487,8 @@ replay:
 			dev = NULL;
 	}
 
+	master_dev = NULL;
+	m_ops = NULL;
 	if (dev) {
 		master_dev = netdev_master_upper_dev_get(dev);
 		if (master_dev)