[PATCH][next] irqchip: Use struct_size() helper in devm_kzalloc()

From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>,
	Marc Zyngier <maz@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	NXP Linux Team <linux-imx@nxp.com>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH][next] irqchip: Use struct_size() helper in devm_kzalloc()
Date: Tue, 16 Jun 2020 18:09:23 -0500	[thread overview]
Message-ID: <20200616230923.GA24937@embeddedor> (raw)

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/irqchip/irq-imx-intmux.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-imx-intmux.c b/drivers/irqchip/irq-imx-intmux.c
index c27577c81126..54d8bb4fc5a1 100644
--- a/drivers/irqchip/irq-imx-intmux.c
+++ b/drivers/irqchip/irq-imx-intmux.c
@@ -210,8 +210,7 @@ static int imx_intmux_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	data = devm_kzalloc(&pdev->dev, sizeof(*data) +
-			    channum * sizeof(data->irqchip_data[0]), GFP_KERNEL);
+	data = devm_kzalloc(&pdev->dev, struct_size(data, irqchip_data, channum), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-- 
2.27.0

