[PATCH net] usbnet: fix error return code in usbnet_probe()

Return error code if usb_maxpacket() returns 0 in usbnet_probe().

Fixes: 397430b50a36 ("usbnet: sanity check for maxpacket")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Wang Hai <redacted>
---
 drivers/net/usb/usbnet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 80432ee0ce69..fb5bf7d36d50 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c

@@ -1790,6 +1790,7 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
 	dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
 	if (dev->maxpacket == 0) {
 		/* that is a broken device */
+		status = -EINVAL;
 		goto out4;
 	}
 

-- 
2.25.1

On Tue, Oct 26, 2021 at 07:25:26PM +0800, Wang Hai wrote:

Return error code if usb_maxpacket() returns 0 in usbnet_probe().

Fixes: 397430b50a36 ("usbnet: sanity check for maxpacket")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Wang Hai <redacted>
---

Good catch. This is embarrassing. I double checked the error path but
failed to notice the missing return value.

But please use -ENODEV here. -EINVAL is typically reserved for bad user
input.

 		goto out4;
 	}

Johan

在 2021/10/26 19:54, Johan Hovold 写道:

On Tue, Oct 26, 2021 at 07:25:26PM +0800, Wang Hai wrote:

quoted

Return error code if usb_maxpacket() returns 0 in usbnet_probe().

Fixes: 397430b50a36 ("usbnet: sanity check for maxpacket")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Wang Hai <redacted>
---

Good catch. This is embarrassing. I double checked the error path but
failed to notice the missing return value.

quoted

  drivers/net/usb/usbnet.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
index 80432ee0ce69..fb5bf7d36d50 100644
--- a/drivers/net/usb/usbnet.c
+++ b/drivers/net/usb/usbnet.c

@@ -1790,6 +1790,7 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
  	dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
  	if (dev->maxpacket == 0) {
  		/* that is a broken device */
+		status = -EINVAL;

But please use -ENODEV here. -EINVAL is typically reserved for bad user
input.

Ok, I will send v2

quoted

  		goto out4;
  	}

Johan
.

-- 
Wang Hai