linux-hardening - [PATCH][next] HID: google: Use struct

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Date:   Tue, 25 Jan 2022 17:37:44 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] HID: google: Use struct_size() helper in kzalloc()

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/hid/hid-google-hammer.c:61:23: warning: using sizeof on a flexible structure

Link: https://github.com/KSPP/linux/issues/174
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/hid/hid-google-hammer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/hid-google-hammer.c b/drivers/hid/hid-google-hammer.c
index 0403beb3104b..ddbe0de177e2 100644
--- a/drivers/hid/hid-google-hammer.c
+++ b/drivers/hid/hid-google-hammer.c
@@ -58,7 +58,7 @@ static int cbas_ec_query_base(struct cros_ec_device *ec_dev, bool get_state,
 	struct cros_ec_command *msg;
 	int ret;
 
-	msg = kzalloc(sizeof(*msg) + max(sizeof(u32), sizeof(*params)),
+	msg = kzalloc(struct_size(msg, data, max(sizeof(u32), sizeof(*params))),
 		      GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;
-- 
2.27.0