linux-kernel - Re: [PATCH] drm/bridge: adv7511: fix race condition bug in adv7511

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Message-ID: <d1eee7a0-8942-5f76-a3f0-74dcfddb95b5@linaro.org>
Date:   Wed, 15 Mar 2023 10:08:21 +0100
From:   neil.armstrong@...aro.org
To:     Zheng Wang <zyytlz.wz@....com>, dri-devel@...ts.freedesktop.org
Cc:     andrzej.hajda@...el.com, jonas@...boo.se, airlied@...il.com,
        daniel@...ll.ch, linux-kernel@...r.kernel.org,
        hackerzheng666@...il.com, 1395428693sheep@...il.com,
        alex000young@...il.com
Subject: Re: [PATCH] drm/bridge: adv7511: fix race condition bug in
 adv7511_remove due to unfinished work

Hi,

On 08/03/2023 18:34, Zheng Wang wrote:
> In adv7511_probe, adv7511->hpd_work is bound with adv7511_hpd_work.
> If we call adv7511_remove with a unfinished work. There may be a
> race condition where bridge->hpd_mutex was destroyed by
> drm_bridge_remove and used in adv7511_hpd_work in drm_bridge_hpd_notify.
> 
> Fix it by canceling the work before cleanup in adv7511_remove.
> 

Can you add the relevant Fixes tag ?

Thanks,
Neil

> Signed-off-by: Zheng Wang <zyytlz.wz@....com>
> ---
>   drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> index ddceafa7b637..9bf72dd6c1d3 100644
> --- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> +++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
> @@ -1349,6 +1349,7 @@ static void adv7511_remove(struct i2c_client *i2c)
>   {
>   	struct adv7511 *adv7511 = i2c_get_clientdata(i2c);
>   
> +	cancel_work_sync(&adv7511->hpd_work);
>   	adv7511_uninit_regulators(adv7511);
>   
>   	drm_bridge_remove(&adv7511->bridge);