Re: [PATCH v1] usb: typec: ucsi: Only set number of plug altmodes after registration

[Benson Leung <bleung@google.com>]

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Hi Jameson,

On Tue, Jun 25, 2024 at 12:46:07AM +0000, Jameson Thies wrote:
> Move the setting of the plug's number of alternate modes into the
> same condition as the plug's registration to prevent dereferencing the
> connector's plug pointer while it is null.
> 
> Fixes: c313a44ac9cd ("usb: typec: ucsi: Always set number of alternate modes")
> Suggested-by: Jon Hunter <jonathanh@nvidia.com>
> Signed-off-by: Jameson Thies <jthies@google.com>

Reviewed-by: Benson Leung <bleung@chromium.org>

Thanks,
Benson

> ---
>  drivers/usb/typec/ucsi/ucsi.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index 76c48d873b2a..77e46bf4a098 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1180,13 +1180,13 @@ static int ucsi_check_cable(struct ucsi_connector *con)
>  		ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
>  		if (ret < 0)
>  			return ret;
> -	}
>  
> -	if (con->plug_altmode[0]) {
> -		num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
> -		typec_plug_set_num_altmodes(con->plug, num_plug_am);
> -	} else {
> -		typec_plug_set_num_altmodes(con->plug, 0);
> +		if (con->plug_altmode[0]) {
> +			num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
> +			typec_plug_set_num_altmodes(con->plug, num_plug_am);
> +		} else {
> +			typec_plug_set_num_altmodes(con->plug, 0);
> +		}
>  	}
>  
>  	return 0;
> 
> base-commit: 819984a0dd3606b7c46fe156cd56a0dc0d604788
> -- 
> 2.45.2.741.gdbec12cfda-goog
> 

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