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

[Piergiorgio Beruto <piergiorgio.beruto@xxxxxxxxx>]

Fix problem found by syzbot dereferencing a device pointer.

Signed-off-by: Piergiorgio Beruto <piergiorgio.beruto@xxxxxxxxx>
Reported-by: syzbot+8cf35743af243e5f417e@xxxxxxxxxxxxxxxxxxxxxxxxx
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