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

---
 drivers/hid/hid-google-hammer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 0403beb3104b..ddbe0de177e2 100644
@@ -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

Applied, thank you Gustavo.

Jiri Kosina
SUSE Labs