linux-kernel - [PATCH] netfilter: ebtables: Use vmalloc

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Message-Id: <20250817091556.80912-1-rongqianfeng@vivo.com>
Date: Sun, 17 Aug 2025 17:15:56 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...filter.org>,
	Florian Westphal <fw@...len.de>,
	Nikolay Aleksandrov <razor@...ckwall.org>,
	Ido Schimmel <idosch@...dia.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	netfilter-devel@...r.kernel.org,
	coreteam@...filter.org,
	bridge@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH] netfilter: ebtables: Use vmalloc_array() to improve code

Remove array_size() calls and replace vmalloc() with vmalloc_array() to
simplify the code.  vmalloc_array() is also optimized better, uses fewer
instructions, and handles overflow more concisely[1].

[1]: https://lore.kernel.org/lkml/abc66ec5-85a4-47e1-9759-2f60ab111971@vivo.com/
Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
 net/bridge/netfilter/ebtables.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 3e67d4aff419..5697e3949a36 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -920,8 +920,8 @@ static int translate_table(struct net *net, const char *name,
 		 * if an error occurs
 		 */
 		newinfo->chainstack =
-			vmalloc(array_size(nr_cpu_ids,
-					   sizeof(*(newinfo->chainstack))));
+			vmalloc_array(nr_cpu_ids,
+				      sizeof(*(newinfo->chainstack)));
 		if (!newinfo->chainstack)
 			return -ENOMEM;
 		for_each_possible_cpu(i) {
@@ -938,7 +938,7 @@ static int translate_table(struct net *net, const char *name,
 			}
 		}
 
-		cl_s = vmalloc(array_size(udc_cnt, sizeof(*cl_s)));
+		cl_s = vmalloc_array(udc_cnt, sizeof(*cl_s));
 		if (!cl_s)
 			return -ENOMEM;
 		i = 0; /* the i'th udc */
@@ -1018,8 +1018,8 @@ static int do_replace_finish(struct net *net, struct ebt_replace *repl,
 	 * the check on the size is done later, when we have the lock
 	 */
 	if (repl->num_counters) {
-		unsigned long size = repl->num_counters * sizeof(*counterstmp);
-		counterstmp = vmalloc(size);
+		counterstmp = vmalloc_array(repl->num_counters,
+					    sizeof(*counterstmp));
 		if (!counterstmp)
 			return -ENOMEM;
 	}
@@ -1386,7 +1386,7 @@ static int do_update_counters(struct net *net, const char *name,
 	if (num_counters == 0)
 		return -EINVAL;
 
-	tmp = vmalloc(array_size(num_counters, sizeof(*tmp)));
+	tmp = vmalloc_array(num_counters, sizeof(*tmp));
 	if (!tmp)
 		return -ENOMEM;
 
@@ -1526,7 +1526,7 @@ static int copy_counters_to_user(struct ebt_table *t,
 	if (num_counters != nentries)
 		return -EINVAL;
 
-	counterstmp = vmalloc(array_size(nentries, sizeof(*counterstmp)));
+	counterstmp = vmalloc_array(nentries, sizeof(*counterstmp));
 	if (!counterstmp)
 		return -ENOMEM;
 
-- 
2.34.1