netdev - [PATCH] net: netlink: fix error check in genl_family_rcv_msg

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Message-Id: <20210403151312.31796-1-paskripkin@gmail.com>
Date:   Sat,  3 Apr 2021 18:13:12 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, johannes.berg@...el.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>
Subject: [PATCH] net: netlink: fix error check in genl_family_rcv_msg_doit

genl_family_rcv_msg_attrs_parse() can return NULL
pointer:

	if (!ops->maxattr)
		return NULL;

But this condition doesn't cause an error in
genl_family_rcv_msg_doit

Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 net/netlink/genetlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 2d6fdf40df66..c06d06ead181 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -719,6 +719,8 @@ static int genl_family_rcv_msg_doit(const struct genl_family *family,
 						  GENL_DONT_VALIDATE_STRICT);
 	if (IS_ERR(attrbuf))
 		return PTR_ERR(attrbuf);
+	if (!attrbuf)
+		return -EINVAL;
 
 	info.snd_seq = nlh->nlmsg_seq;
 	info.snd_portid = NETLINK_CB(skb).portid;
-- 
2.30.2