netdev - [PATCH net-next 1/1] ethtool/plca: fix potential NULL pointer access

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Date:   Tue, 17 Jan 2023 00:57:19 +0100
From:   Piergiorgio Beruto <piergiorgio.beruto@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Oleksij Rempel <o.rempel@...gutronix.de>,
        mailhol.vincent@...adoo.fr, sudheer.mogilappagari@...el.com,
        sbhatta@...vell.com, linux-doc@...r.kernel.org,
        wangjie125@...wei.com, corbet@....net, lkp@...el.com,
        gal@...dia.com, gustavoars@...nel.org, bagasdotme@...il.com
Subject: [PATCH net-next 1/1] ethtool/plca: fix potential NULL pointer access

Fix problem found by syzbot dereferencing a device pointer.

Signed-off-by: Piergiorgio Beruto <piergiorgio.beruto@...il.com>
Reported-by: syzbot+8cf35743af243e5f417e@...kaller.appspotmail.com
Fixes: 8580e16c28f3 ("net/ethtool: add netlink interface for the PLCA RS")
---
 net/ethtool/plca.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ethtool/plca.c b/net/ethtool/plca.c
index be7404dc9ef2..bc3d31f99998 100644
--- a/net/ethtool/plca.c
+++ b/net/ethtool/plca.c
@@ -155,6 +155,8 @@ int ethnl_set_plca_cfg(struct sk_buff *skb, struct genl_info *info)
 		return ret;
 
 	dev = req_info.dev;
+	if(!dev)
+		return -ENODEV;
 
 	rtnl_lock();
 
-- 
2.37.4