linux-kernel - Re: [PATCH] usb: typec: tcpm: Fix a signedness bug in tcpm_fw_get

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Message-ID: <20191001115442.GB22609@kadam>
Date:   Tue, 1 Oct 2019 14:54:42 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] usb: typec: tcpm: Fix a signedness bug in
 tcpm_fw_get_caps()

On Thu, Sep 26, 2019 at 05:53:10AM -0700, Guenter Roeck wrote:
> 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@...cle.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'm happy that you think there is a tool which generates warnings like
that but it's just people manually complaining.  :P

I'll resend though.

regards,
dan carpenter