From 05cd823863fd32e9fcd5e8818a0a9070e54cfcc1 Mon Sep 17 00:00:00 2001 From: Li Zhong Date: Wed, 21 Sep 2022 11:17:16 -0700 Subject: [PATCH] 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. There is, however, no real bug here since if the skb is full nla_put_be16() will fail as well and we'll error out. Signed-off-by: Li Zhong Link: https://lore.kernel.org/r/20220921181716.1629541-1-floridsleeves@gmail.com Signed-off-by: Jakub Kicinski --- 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)) ||