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Date:   Tue, 25 Jan 2022 13:26:34 -0600
From:   "Gustavo A. R. Silva" <>
To:     MyungJoo Ham <>,
        Chanwoo Choi <>,
        Benson Leung <>,
        Guenter Roeck <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] extcon: usbc-cros-ec: Use struct_size() helper in

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.

Also, address the following sparse warnings:
drivers/extcon/extcon-usbc-cros-ec.c:71:23: warning: using sizeof on a flexible structure

Signed-off-by: Gustavo A. R. Silva <>
 drivers/extcon/extcon-usbc-cros-ec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/extcon/extcon-usbc-cros-ec.c b/drivers/extcon/extcon-usbc-cros-ec.c
index 5290cc2d19d9..fde1db62be0d 100644
--- a/drivers/extcon/extcon-usbc-cros-ec.c
+++ b/drivers/extcon/extcon-usbc-cros-ec.c
@@ -68,7 +68,7 @@ static int cros_ec_pd_command(struct cros_ec_extcon_info *info,
 	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;

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