linux-kernel - [PATCH 1/1] power: supply: cros_peripheral: Use struct

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Message-Id: <20220607150344.30669-1-xiaohuizhang@ruc.edu.cn>
Date:   Tue,  7 Jun 2022 23:03:44 +0800
From:   Xiaohui Zhang <xiaohuizhang@....edu.cn>
To:     Xiaohui Zhang <xiaohuizhang@....edu.cn>,
        Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] power: supply: cros_peripheral: Use struct_size() helper in kzalloc()

Similar to the handling of cros_usbpd_charger_ec_command in commit 441d38c60fbe
("power: supply: cros_usbpd: Use struct_size() helper in kzalloc()"),
we thought a patch might be needed here as well.

Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worst scenario, could lead to heap overflows.

Signed-off-by: Xiaohui Zhang <xiaohuizhang@....edu.cn>
---
 drivers/power/supply/cros_peripheral_charger.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/cros_peripheral_charger.c b/drivers/power/supply/cros_peripheral_charger.c
index 9fe6d826148d..1379afd9698d 100644
--- a/drivers/power/supply/cros_peripheral_charger.c
+++ b/drivers/power/supply/cros_peripheral_charger.c
@@ -63,7 +63,7 @@ static int cros_pchg_ec_command(const struct charger_data *charger,
 	struct cros_ec_command *msg;
 	int ret;
 
-	msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
+	msg = kzalloc(struct_size(msg, data, max(outsize, insize)), GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;
 
-- 
2.17.1