From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Mon, 17 Apr 2023 15:50:28 +0000 (+0200)
Subject: netfilter: nf_tables: tighten netlink attribute requirements for catch-all elements
X-Git-Tag: v6.6.17~5123^2~15^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d4eb7e39929a3b1ff30fb751b4859fc2410702a0;p=platform%2Fkernel%2Flinux-rpi.git

netfilter: nf_tables: tighten netlink attribute requirements for catch-all elements

If NFT_SET_ELEM_CATCHALL is set on, then userspace provides no set element
key. Otherwise, bail out with -EINVAL.

Fixes: aaa31047a6d2 ("netfilter: nftables: add catch-all set element support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 98043e8..e48ab8d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6108,7 +6108,8 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 	if (err < 0)
 		return err;
 
-	if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
+	if (((flags & NFT_SET_ELEM_CATCHALL) && nla[NFTA_SET_ELEM_KEY]) ||
+	    (!(flags & NFT_SET_ELEM_CATCHALL) && !nla[NFTA_SET_ELEM_KEY]))
 		return -EINVAL;
 
 	if (flags != 0) {