[SRU][J][PATCH v2 3/3] netfilter: nf_tables: missing iterator type in lookup walk

[Bethany Jamison]

From: Pablo Neira Ayuso <pablo at netfilter.org>

Add missing decorator type to lookup expression and tighten WARN_ON_ONCE
check in pipapo to spot earlier that this is unset.

Fixes: 29b359cf6d95 ("netfilter: nft_set_pipapo: walk over current view on netlink dump")
Signed-off-by: Pablo Neira Ayuso <pablo at netfilter.org>
(cherry picked from commit efefd4f00c967d00ad7abe092554ffbb70c1a793)
CVE-2024-27017
Signed-off-by: Bethany Jamison <bethany.jamison at canonical.com>
---
 net/netfilter/nft_lookup.c     | 1 +
 net/netfilter/nft_set_pipapo.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c
index 9d18c5428d53c..8c33159d11fe2 100644
--- a/net/netfilter/nft_lookup.c
+++ b/net/netfilter/nft_lookup.c
@@ -210,6 +210,7 @@ static int nft_lookup_validate(const struct nft_ctx *ctx,
 		return 0;
 
 	iter.genmask	= nft_genmask_next(ctx->net);
+	iter.type	= NFT_ITER_UPDATE;
 	iter.skip	= 0;
 	iter.count	= 0;
 	iter.err	= 0;
diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c
index 56250c12aefa7..f2f8d15c9edac 100644
--- a/net/netfilter/nft_set_pipapo.c
+++ b/net/netfilter/nft_set_pipapo.c
@@ -2042,7 +2042,8 @@ static void nft_pipapo_walk(const struct nft_ctx *ctx, struct nft_set *set,
 	const struct nft_pipapo_field *f;
 	int i, r;
 
-	WARN_ON_ONCE(iter->type == NFT_ITER_UNSPEC);
+	WARN_ON_ONCE(iter->type != NFT_ITER_READ &&
+		     iter->type != NFT_ITER_UPDATE);
 
 	rcu_read_lock();
 	if (iter->type == NFT_ITER_READ)
-- 
2.34.1