linux-kernel - [PATCH] soc/qcom: use struct_size over open coded arithmetic

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Date:   Wed, 16 Feb 2022 03:07:59 +0000
From:   cgel.zte@...il.com
To:     agross@...nel.org
Cc:     bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Minghao Chi (CGEL ZTE)" <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] soc/qcom: use struct_size over open coded arithmetic

From: "Minghao Chi (CGEL ZTE)" <chi.minghao@....com.cn>

Replace zero-length array with flexible-array member and make use
of the struct_size() helper in kzalloc(). For example:

struct apr_rx_buf {
	struct list_head node;
	int len;
	uint8_t buf[];
};

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

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
---
 drivers/soc/qcom/apr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/apr.c b/drivers/soc/qcom/apr.c
index 82ca12c9328a..0813dbc5e462 100644
--- a/drivers/soc/qcom/apr.c
+++ b/drivers/soc/qcom/apr.c
@@ -171,7 +171,7 @@ static int apr_callback(struct rpmsg_device *rpdev, void *buf,
 		return -EINVAL;
 	}
 
-	abuf = kzalloc(sizeof(*abuf) + len, GFP_ATOMIC);
+	abuf = kzalloc((struct_size(abuf, buf, len), GFP_ATOMIC);
 	if (!abuf)
 		return -ENOMEM;
 
-- 
2.25.1