From: Guenter Roeck <linux@roeck-us.net>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] usb: typec: tcpm: Fix a signedness bug in tcpm_fw_get_caps()
Date: Thu, 26 Sep 2019 05:53:10 -0700 [thread overview]
Message-ID: <20190926125310.GA9967@roeck-us.net> (raw)
In-Reply-To: <20190925110219.GN3264@mwanda>
On Wed, Sep 25, 2019 at 02:02:19PM +0300, Dan Carpenter wrote:
> The "port->typec_caps.data" and "port->typec_caps.type" variables are
> enums and in this context GCC will treat them as an unsigned int so they
> can never be less than zero.
>
> Fixes: ae8a2ca8a221 ("usb: typec: Group all TCPCI/TCPM code together")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> drivers/usb/typec/tcpm/tcpm.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 96562744101c..d3b63e000ae2 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -4410,7 +4410,7 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
> ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
> if (ret == 0) {
> port->typec_caps.data = typec_find_port_data_role(cap_str);
> - if (port->typec_caps.data < 0)
> + if ((int)port->typec_caps.data < 0)
> return -EINVAL;
Doesn't that also cause a warning about overwriting error return codes ?
I would prefer something like
ret = typec_find_port_data_role(cap_str);
if (ret < 0)
return ret;
port->typec_caps.data = ret;
Guenter
> }
>
> @@ -4419,7 +4419,7 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
> return ret;
>
> port->typec_caps.type = typec_find_port_power_role(cap_str);
> - if (port->typec_caps.type < 0)
> + if ((int)port->typec_caps.type < 0)
> return -EINVAL;
> port->port_type = port->typec_caps.type;
>
> --
> 2.20.1
>
next prev parent reply other threads:[~2019-09-26 12:53 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 11:02 [PATCH] usb: typec: tcpm: Fix a signedness bug in tcpm_fw_get_caps() Dan Carpenter
2019-09-26 12:53 ` Guenter Roeck [this message]
2019-10-01 11:54 ` Dan Carpenter
2019-10-01 13:40 ` Guenter Roeck
2019-10-01 12:01 ` [PATCH v2] usb: typec: tcpm: " Dan Carpenter
2019-10-01 12:04 ` Heikki Krogerus
2019-10-01 13:42 ` Guenter Roeck
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