linux-kernel - Re: [Linux-kernel-mentees] [PATCH v2] usbhid: Fix slab-out-of-bounds write in hiddev_ioctl

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Date:   Thu, 23 Jul 2020 17:51:21 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Peilin Ye <yepeilin.cs@...il.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        syzkaller-bugs@...glegroups.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-usb@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Linux-kernel-mentees] [PATCH v2] usbhid: Fix slab-out-of-bounds
 write in hiddev_ioctl_usage()

On Mon, Jul 20, 2020 at 03:52:09PM -0400, Peilin Ye wrote:
> `uref->usage_index` is not always being properly checked, causing
> hiddev_ioctl_usage() to go out of bounds under some cases. Fix it.
> 
> Reported-by: syzbot+34ee1b45d88571c2fa8b@...kaller.appspotmail.com
> Link: https://syzkaller.appspot.com/bug?id=f2aebe90b8c56806b050a20b36f51ed6acabe802
> Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
> ---
> Change in v2:
>     - Add the same check for the `HIDIOCGUSAGE` case. (Suggested by
>       Dan Carpenter <dan.carpenter@...cle.com>)

Looks good to me.  Thanks!

Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

regards,
dan carpenter