[PATCH 6.1 08/69] netfilter: nft_set_pipapo: clamp maximum map bucket size to INT_MAX

Greg Kroah-Hartman
2026-02-09T14:43:33Z

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

commit b85e3367a5716ed3662a4fe266525190d2af76df upstream.

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@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
[ Keerthana: Handle freeing new_lt ]
Signed-off-by: Keerthana K <keerthana.kalyanasundaram@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/netfilter/nft_set_pipapo.c | 8 ++++++++
1 file changed, 8 insertions(+)

--- a/net/netfilter/nft_set_pipapo.c
+++ b/net/netfilter/nft_set_pipapo.c
@@ -667,6 +667,11 @@ static int pipapo_resize(struct nft_pipa
}

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);
@@ -1360,6 +1365,9 @@ static struct nft_pipapo_match *pipapo_c
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;