From c4186c5376ee73efff005dbd23dd73a8e06e6ad8 Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Wed, 20 Sep 2023 16:26:07 +0200
Subject: [PATCH] netlink: handle invalid etype in set_make_key()

It's not clear to me, what ensures that the etype is always valid.
Handle a NULL.

Fixes: 6e48df5329ea ('src: add "typeof" build/parse/print support')
Signed-off-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
 src/netlink.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/netlink.c b/src/netlink.c
index 2489e986..70ebf382 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -896,6 +896,8 @@ static struct expr *set_make_key(const struct nftnl_udata *attr)
 
 	etype = nftnl_udata_get_u32(ud[NFTNL_UDATA_SET_TYPEOF_EXPR]);
 	ops = expr_ops_by_type(etype);
+	if (!ops)
+		return NULL;
 
 	expr = ops->parse_udata(ud[NFTNL_UDATA_SET_TYPEOF_DATA]);
 	if (!expr)
-- 
2.33.0