linux-kernel - Re: [PATCH] hidraw: Fix crash on HIDIOCGFEATURE with a destroyed device

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Date:   Mon, 9 Apr 2018 09:30:48 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Rodrigo Rivas Costa <rodrigorivascosta@...il.com>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hidraw: Fix crash on HIDIOCGFEATURE with a destroyed
 device

On Fri, 6 Apr 2018, Rodrigo Rivas Costa wrote:

> Doing `ioctl(HIDIOCGFEATURE)` in a tight loop on a hidraw device
> and then disconnecting the device, or unloading the driver, can
> cause a NULL pointer dereference.
> 
> When a hidraw device is destroyed it sets 0 to `dev->exist`.
> Most functions check 'dev->exist' before doing its work, but
> `hidraw_get_report()` was missing that check.
> 
> Signed-off-by: Rodrigo Rivas Costa <rodrigorivascosta@...il.com>

Applied, thank you.

-- 
Jiri Kosina
SUSE Labs