linux-kernel - Re: [PATCH v2 3/3] usb: typec: tipd: Remove WARN_ON in tps6598x_block

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Date:   Wed, 15 Sep 2021 10:23:04 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] usb: typec: tipd: Remove WARN_ON in
 tps6598x_block_read

On Tue, Sep 14, 2021 at 04:02:35PM +0200, Sven Peter wrote:
> Calling tps6598x_block_read with a higher than allowed len can be
> handled by just returning an error. There's no need to crash systems
> with panic-on-warn enabled.
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> v1 -> v2:
>  - added this patch to also remove the WARN_ON in tps6598x_block_read
>    as suggested by greg k-h
> 
>  drivers/usb/typec/tipd/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 8c79ba17a157..93e56291f0cf 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -117,7 +117,7 @@ tps6598x_block_read(struct tps6598x *tps, u8 reg, void *val, size_t len)
>  	u8 data[TPS_MAX_LEN + 1];
>  	int ret;
>  
> -	if (WARN_ON(len + 1 > sizeof(data)))
> +	if (len + 1 > sizeof(data))
>  		return -EINVAL;
>  
>  	if (!tps->i2c_protocol)
> -- 
> 2.25.1

thanks,

-- 
heikki