linux-kernel - Re: [PATCH v3] usb: typec: bus: verify partner exists in typec_altmode

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Date:   Mon, 14 Aug 2023 16:36:02 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     RD Babiera <rdbabiera@...gle.com>
Cc:     gregkh@...uxfoundation.org, linux@...ck-us.net, badhri@...gle.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v3] usb: typec: bus: verify partner exists in
 typec_altmode_attention

On Fri, Aug 11, 2023 at 09:37:32PM +0000, RD Babiera wrote:
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 5a7d8cc04628..97b7b22e9cf1 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -1791,6 +1791,7 @@ static void tcpm_handle_vdm_request(struct tcpm_port *port,
>  	u32 p[PD_MAX_PAYLOAD];
>  	u32 response[8] = { };
>  	int i, rlen = 0;
> +	int ret;
>  
>  	for (i = 0; i < cnt; i++)
>  		p[i] = le32_to_cpu(payload[i]);
> @@ -1877,7 +1878,9 @@ static void tcpm_handle_vdm_request(struct tcpm_port *port,
>  			}
>  			break;
>  		case ADEV_ATTENTION:
> -			typec_altmode_attention(adev, p[1]);
> +			ret = typec_altmode_attention(adev, p[1]);
> +			if (ret)
> +				tcpm_log(port, "typec_altmode_attention NULL port partner altmode");

I don't think you need that ret variable:

                        if (typec_altmode_attention(adev, p[1]))
				tcpm_log(port, "typec_altmode_attention NULL port partner altmode");

>  			break;
>  		}
>  	}

thanks,

-- 
heikki