linux-kernel - [PATCH 4/4] pinctrl: sunxi: use kcalloc() instead of kzalloc()

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Message-Id: <20250819143935.372084-5-rongqianfeng@vivo.com>
Date: Tue, 19 Aug 2025 22:39:35 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Linus Walleij <linus.walleij@...aro.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	linux-gpio@...r.kernel.org (open list:PIN CONTROL SUBSYSTEM),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Allwinner sunXi SoC support),
	linux-sunxi@...ts.linux.dev (open list:ARM/Allwinner sunXi SoC support),
	linux-kernel@...r.kernel.org (open list)
Cc: Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH 4/4] pinctrl: sunxi: use kcalloc() instead of kzalloc()

Use devm_kcalloc() in init_pins_table() and prepare_function_table() to
gain built-in overflow protection, making memory allocation safer when
calculating allocation size compared to explicit multiplication.

Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
 drivers/pinctrl/sunxi/pinctrl-sunxi-dt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi-dt.c b/drivers/pinctrl/sunxi/pinctrl-sunxi-dt.c
index 4e34b0cd3b73..5f13315ebff3 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi-dt.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi-dt.c
@@ -103,7 +103,7 @@ static struct sunxi_desc_pin *init_pins_table(struct device *dev,
 		return ERR_PTR(-EINVAL);
 	}
 
-	pins = devm_kzalloc(dev, desc->npins * sizeof(*pins), GFP_KERNEL);
+	pins = devm_kcalloc(dev, desc->npins, sizeof(*pins), GFP_KERNEL);
 	if (!pins)
 		return ERR_PTR(-ENOMEM);
 
@@ -199,7 +199,7 @@ static int prepare_function_table(struct device *dev, struct device_node *pnode,
 	 * Allocate the memory needed for the functions in one table.
 	 * We later use pointers into this table to mark each pin.
 	 */
-	func = devm_kzalloc(dev, num_funcs * sizeof(*func), GFP_KERNEL);
+	func = devm_kcalloc(dev, num_funcs, sizeof(*func), GFP_KERNEL);
 	if (!func)
 		return -ENOMEM;
 
-- 
2.34.1