Re: [PATCH] usb: typec: tcpm: Fix a signedness bug in tcpm_fw_get_caps()

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On 10/1/19 4:54 AM, Dan Carpenter wrote:
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@xxxxxxxxxx>
---
  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 am quite sure there is, or at least used to be - I have seen such warnings.
Maybe it was removed.

Guenter



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