linux-kernel - [PATCH v5.10-v6.6 ] netfilter: nft_set_pipapo: clamp maximum map bucket size to INT

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Message-ID: <20260205074229.2091135-1-keerthana.kalyanasundaram@broadcom.com>
Date: Thu,  5 Feb 2026 07:42:29 +0000
From: Keerthana K <keerthana.kalyanasundaram@...adcom.com>
To: stable@...r.kernel.org,
	gregkh@...uxfoundation.org
Cc: pablo@...filter.org,
	kadlec@...filter.org,
	fw@...len.de,
	davem@...emloft.net,
	kuba@...nel.org,
	netfilter-devel@...r.kernel.org,
	coreteam@...filter.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	ajay.kaher@...adcom.com,
	alexey.makhalov@...adcom.com,
	vamsi-krishna.brahmajosyula@...adcom.com,
	yin.ding@...adcom.com,
	tapas.kundu@...adcom.com,
	Stefano Brivio <sbrivio@...hat.com>,
	Sasha Levin <sashal@...nel.org>,
	Keerthana K <keerthana.kalyanasundaram@...adcom.com>
Subject: [PATCH v5.10-v6.6 ] netfilter: nft_set_pipapo: clamp maximum map bucket size to INT_MAX

From: Pablo Neira Ayuso <pablo@...filter.org>

[ Upstream commit b85e3367a5716ed3662a4fe266525190d2af76df ]

Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof()
when resizing hashtable because __GFP_NOWARN is unset.

Similar to:

  b541ba7d1f5a ("netfilter: conntrack: clamp maximum hashtable size to INT_MAX")

Reviewed-by: Stefano Brivio <sbrivio@...hat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
[ Keerthana: Handle freeing new_lt ]
Signed-off-by: Keerthana K <keerthana.kalyanasundaram@...adcom.com>
---
 net/netfilter/nft_set_pipapo.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/netfilter/nft_set_pipapo.c b/net/netfilter/nft_set_pipapo.c
index 6813ff660b72..484ca8cf2e80 100644
--- a/net/netfilter/nft_set_pipapo.c
+++ b/net/netfilter/nft_set_pipapo.c
@@ -665,6 +665,11 @@ static int pipapo_resize(struct nft_pipapo_field *f, int old_rules, int rules)
 	}
 
 mt:
+	if (rules > (INT_MAX / sizeof(*new_mt))) {
+		kvfree(new_lt);
+		return -ENOMEM;
+	}
+
 	new_mt = kvmalloc(rules * sizeof(*new_mt), GFP_KERNEL);
 	if (!new_mt) {
 		kvfree(new_lt);
@@ -1358,6 +1361,9 @@ static struct nft_pipapo_match *pipapo_clone(struct nft_pipapo_match *old)
 		       src->bsize * sizeof(*dst->lt) *
 		       src->groups * NFT_PIPAPO_BUCKETS(src->bb));
 
+		if (src->rules > (INT_MAX / sizeof(*src->mt)))
+			goto out_mt;
+
 		dst->mt = kvmalloc(src->rules * sizeof(*src->mt), GFP_KERNEL);
 		if (!dst->mt)
 			goto out_mt;
-- 
2.43.7