linux-kernel - [PATCH AUTOSEL 5.14 17/40] netfilter: nf_tables: Fix oversized kvmalloc() calls

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Message-Id: <20211005135020.214291-17-sashal@kernel.org>
Date:   Tue,  5 Oct 2021 09:49:56 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        syzbot+cd43695a64bcd21b8596@...kaller.appspotmail.com,
        Sasha Levin <sashal@...nel.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
Subject: [PATCH AUTOSEL 5.14 17/40] netfilter: nf_tables: Fix oversized kvmalloc() calls

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

[ Upstream commit 45928afe94a094bcda9af858b96673d59bc4a0e9 ]

The commit 7661809d493b ("mm: don't allow oversized kvmalloc() calls")
limits the max allocatable memory via kvmalloc() to MAX_INT.

Reported-by: syzbot+cd43695a64bcd21b8596@...kaller.appspotmail.com
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/netfilter/nf_tables_api.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 081437dd75b7..4b6255c4b183 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4336,7 +4336,7 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info,
 	if (ops->privsize != NULL)
 		size = ops->privsize(nla, &desc);
 	alloc_size = sizeof(*set) + size + udlen;
-	if (alloc_size < size)
+	if (alloc_size < size || alloc_size > INT_MAX)
 		return -ENOMEM;
 	set = kvzalloc(alloc_size, GFP_KERNEL);
 	if (!set)
-- 
2.33.0