netdev - [PATCH net-next v2] net/ethtool/tunnels: check the return value of nla_nest

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Message-Id: <20220921083004.1612113-1-floridsleeves@gmail.com>
Date:   Wed, 21 Sep 2022 01:30:04 -0700
From:   Li Zhong <floridsleeves@...il.com>
To:     netdev@...r.kernel.org
Cc:     pabeni@...hat.com, kuba@...nel.org, edumazet@...gle.com,
        davem@...emloft.net, Li Zhong <floridsleeves@...il.com>
Subject: [PATCH net-next v2] net/ethtool/tunnels: check the return value of nla_nest_start()

Check the return value of nla_nest_start(). When starting the entry
level nested attributes, if the tailroom of socket buffer is
insufficient to store the attribute header and payload, the return value
will be NULL and we should check it. If it is NULL, go to the
error_cancel_entry label to do error handling.

v2: error handling jump to error_cancel_entry, more details in commit 
meesage

Signed-off-by: Li Zhong <floridsleeves@...il.com>
---
 net/ethtool/tunnels.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ethtool/tunnels.c b/net/ethtool/tunnels.c
index efde33536687..67fb414ca859 100644
--- a/net/ethtool/tunnels.c
+++ b/net/ethtool/tunnels.c
@@ -136,6 +136,8 @@ ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
 			goto err_cancel_table;
 
 		entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
+		if (!entry)
+			goto err_cancel_entry;
 
 		if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
 				 htons(IANA_VXLAN_UDP_PORT)) ||
-- 
2.25.1