2022-01-26 13:06:02

by Gustavo A. R. Silva

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 <[email protected]>
---
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

2022-02-03 20:31:28

by Jiri Kosina

Subject: Re: [PATCH][next] HID: google: Use struct_size() helper in kzalloc()

On Tue, 25 Jan 2022, Gustavo A. R. Silva wrote:

> 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 <[email protected]>

Applied, thank you Gustavo.

--
Jiri Kosina
SUSE Labs