From patchwork Thu Jan 9 12:35:30 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pablo Neira Ayuso X-Patchwork-Id: 13932476 X-Patchwork-Delegate: kuba@kernel.org Received: from mail.netfilter.org (mail.netfilter.org [217.70.188.207]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2A7B91E515; Thu, 9 Jan 2025 12:35:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.188.207 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736426141; cv=none; b=NzUFp98k81+aez/iW2r6ANH2WDGAO+U9PNjKbh8bBV1cGrkfZlkOR+w2UTe4KyuWYkF6qk75EWlFfkkvpd11ePf2I1wJftXk5WbdimD3f5gfQ8y0jWscxYuKLN/VigRARPd8uNd1ac0DYspEeW04dRRamGMHFDRsr76540KNgaM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736426141; c=relaxed/simple; bh=VrpoQ52emWyqkUGmWVhGMz5fW6VKRC+kZA4gj8SyEjM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NeuyHTOiamvLcZ4jApB9YDRQusntLFr2r/lu5Tk1H1gMWopavucWrjgRlG9upn5G/UWV5tNtTRiP4a3sfiG06B2ZAnRYbwxN/5u9Pv8yx2RNbv6X21l5ehdEXspsdLtXqG1XHGZyPWbAXA09iA9dePiUv34wbicAAHO628ZPS3I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org; spf=pass smtp.mailfrom=netfilter.org; arc=none smtp.client-ip=217.70.188.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=netfilter.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=netfilter.org From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org, pabeni@redhat.com, edumazet@google.com, fw@strlen.de Subject: [PATCH nf] netfilter: conntrack: clamp maximum hashtable size to INT_MAX Date: Thu, 9 Jan 2025 13:35:30 +0100 Message-Id: <20250109123532.41768-2-pablo@netfilter.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20250109123532.41768-1-pablo@netfilter.org> References: <20250109123532.41768-1-pablo@netfilter.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org According to 0708a0afe291 ("mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls"), use INT_MAX as maximum size for the conntrack hashtable. Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when __GFP_NOWARN flag is unset when resizing. Note: hashtable resize is only possible from init_netns. Fixes: 9cc1c73ad666 ("netfilter: conntrack: avoid integer overflow when resizing") Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_core.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 8666d733b984..7f8b245e287a 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -2510,12 +2510,15 @@ void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) struct hlist_nulls_head *hash; unsigned int nr_slots, i; - if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head))) + if (*sizep > (INT_MAX / sizeof(struct hlist_nulls_head))) return NULL; BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); + if (nr_slots > (INT_MAX / sizeof(struct hlist_nulls_head))) + return NULL; + hash = kvcalloc(nr_slots, sizeof(struct hlist_nulls_head), GFP_KERNEL); if (hash && nulls)