linux-kernel - Re: [PATCH v3] HID: cp2112: Add parameter validation to data length

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Message-ID: <rq068421-84np-1s12-rq78-1q36q047qq04@xreary.bet>
Date: Tue, 14 Oct 2025 11:47:35 +0200 (CEST)
From: Jiri Kosina <jikos@...nel.org>
To: Deepak Sharma <deepak.sharma.472935@...il.com>
cc: bentiss@...nel.org, linux-input@...r.kernel.org, 
    linux-kernel@...r.kernel.org, linux-kernel-mentees@...ts.linux.dev, 
    skhan@...uxfoundation.org, david.hunter.linux@...il.com, 
    syzbot+7617e19c8a59edfbd879@...kaller.appspotmail.com
Subject: Re: [PATCH v3] HID: cp2112: Add parameter validation to data
 length

On Fri, 26 Sep 2025, Deepak Sharma wrote:

> Syzkaller reported a stack OOB access in cp2112_write_req caused by lack
> of parameter validation for the user input in I2C SMBUS ioctl in cp2112
> driver
> 
> Add the parameter validation for the data->block[0] to be bounded by
> I2C_SMBUS_BLOCK_MAX + the additional compatibility padding
> 
> Reported-by: syzbot+7617e19c8a59edfbd879@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=7617e19c8a59edfbd879
> Tested-by: syzbot+7617e19c8a59edfbd879@...kaller.appspotmail.com
> Signed-off-by: Deepak Sharma <deepak.sharma.472935@...il.com>

Applied to hid.git#for-6.18/upstream-fixes, thanks.

-- 
Jiri Kosina
SUSE Labs