linux-kernel - Re: [PATCH] TDA1997x: fix tda1997x

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Date:   Thu, 29 Jul 2021 11:55:47 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Krzysztof Hałasa <khalasa@...p.pl>,
        Tim Harvey <tharvey@...eworks.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] TDA1997x: fix tda1997x_remove()

On 26/07/2021 12:44, Krzysztof Hałasa wrote:
> TDA1997x I2C "client data" pointer was never set in tda1997x_probe(),
> then the code tried to use invalid pointer in tda1997x_remove().
> 
> Signed-off-by: Krzysztof Hałasa <khalasa@...p.pl>
> 
> diff --git a/drivers/media/i2c/tda1997x.c b/drivers/media/i2c/tda1997x.c
> index 71194746c874..043cc8275d00 100644
> --- a/drivers/media/i2c/tda1997x.c
> +++ b/drivers/media/i2c/tda1997x.c
> @@ -2771,6 +2771,7 @@ static int tda1997x_probe(struct i2c_client *client,
>  		goto err_free_media;
>  	}
>  
> +	i2c_set_clientdata(client, sd);
>  	return 0;
>  
>  err_free_media:
> 

Actually, v4l2_i2c_subdev_init() sets this, and v4l2_i2c_subdev_init() *is* called.
Does it really crash in tda1997x_remove() without this patch?

If so, then I suspect something else is going on.

Regards,

	Hans