linux-kernel - Re: [PATCH] HID: input: fix leaking custom input node name

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Date:   Tue, 28 Aug 2018 14:06:46 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Stefan Agner <stefan@...er.ch>
cc:     benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] HID: input: fix leaking custom input node name

On Tue, 28 Aug 2018, Stefan Agner wrote:

> Make sure to free the custom input node name on disconnect.
> 
> Cc: stable@...r.kernel.org # v4.18+
> Fixes: c554bb045511 ("HID: input: append a suffix matching the application")
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
> Found with kmemleak, after unplugging a Logitech Unifying receiver:
> 
> unreferenced object 0xc2345b80 (size 64):
>   comm "kworker/0:1", pid 20, jiffies 4294955181 (age 320.740s)
>   hex dump (first 32 bytes):
>     4c 6f 67 69 74 65 63 68 20 55 53 42 20 52 65 63  Logitech USB Rec
>     65 69 76 65 72 20 53 79 73 74 65 6d 20 43 6f 6e  eiver System Con
>   backtrace:
>     [<8fec5a71>] __kmalloc_track_caller+0x1dc/0x300
>     [<5b926275>] kvasprintf+0x60/0xcc
>     [<21fc360f>] kasprintf+0x38/0x54
>     [<3b6ce9f0>] hidinput_connect+0x23a8/0x4c60
>     [<deaab707>] hid_connect+0x30c/0x38c
>     [<5a28f7c9>] hid_hw_start+0x44/0x64
>     [<267d70e8>] hid_generic_probe+0x34/0x38
>     [<d68c31b1>] hid_device_probe+0xdc/0x13c
>     [<09414e91>] really_probe+0x1d8/0x2c4
>     [<f9d7157f>] driver_probe_device+0x68/0x184
>     [<1def17c8>] __device_attach_driver+0xa0/0xd4
>     [<d3b2081b>] bus_for_each_drv+0x60/0xc0
>     [<379d02f8>] __device_attach+0xdc/0x144
>     [<7026ace5>] device_initial_probe+0x14/0x18
>     [<44527d01>] bus_probe_device+0x90/0x98
>     [<cf58bf2f>] device_add+0x424/0x62c
> 
>  drivers/hid/hid-input.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 4e94ea3e280a..ac201817a2dd 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -1815,6 +1815,7 @@ void hidinput_disconnect(struct hid_device *hid)
>  			input_unregister_device(hidinput->input);
>  		else
>  			input_free_device(hidinput->input);
> +		kfree(hidinput->name);
>  		kfree(hidinput);

Applied for 4.19, thanks.

-- 
Jiri Kosina
SUSE Labs