netdev - [PATCH v3] wifi: cfg80211: Use kmemdup_array instead of kmemdup for multiple allocation

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Message-Id: <20240822024242.1203161-1-yujiaoliang@vivo.com>
Date: Thu, 22 Aug 2024 10:42:42 +0800
From: Yu Jiaoliang <yujiaoliang@...o.com>
To: Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com
Subject: [PATCH v3] wifi: cfg80211: Use kmemdup_array instead of kmemdup for multiple allocation

Let the kememdup_array() take care about multiplication and possible
overflows.

---
v2:
-Change sizeof(limits[0]) to sizeof(*limits)
-Fix title prefix

v3:
-Fix R-b tag
-Leave --- above this information

Signed-off-by: Yu Jiaoliang <yujiaoliang@...o.com>
Reviewed-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 net/wireless/util.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 9a7c3adc8a3b..e7c1ac2a0f2d 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -2435,8 +2435,8 @@ int cfg80211_iter_combinations(struct wiphy *wiphy,
 		if (params->num_different_channels > c->num_different_channels)
 			continue;
 
-		limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
-				 GFP_KERNEL);
+		limits = kmemdup_array(c->limits, c->n_limits, sizeof(*limits),
+				       GFP_KERNEL);
 		if (!limits)
 			return -ENOMEM;
 
-- 
2.34.1