usb: fallback safely when a configuration descriptor is too large

When a USB configuration descriptor was larger than our USB buffer
(512 bytes), we were skipping the full descriptor reading but then we
were still parsing and using it, triggering memory corruptions.
Now in that case, it just skips this device enumeration and displays the
appropriate message to the user, so he can fix the buffer if he wants.

This bug was triggered by some UVC webcams which have very large
configuration descriptors (e.g. a couple of kB) describing all their
supported video encodings.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

common/usb.c

@@ -508,8 +508,8 @@ int usb_get_configuration_no(struct usb_device *dev,
 	tmp = le16_to_cpu(config->wTotalLength);
 
 	if (tmp > USB_BUFSIZ) {
-		USB_PRINTF("usb_get_configuration_no: failed to get " \
-			   "descriptor - too long: %d\n", tmp);
+		printf("usb_get_configuration_no: failed to get " \
+		       "descriptor - too long: %d\n", tmp);
 		return -1;
 	}
 
@@ -946,7 +946,13 @@ int usb_new_device(struct usb_device *dev)
 	le16_to_cpus(&dev->descriptor.idProduct);
 	le16_to_cpus(&dev->descriptor.bcdDevice);
 	/* only support for one config for now */
-	usb_get_configuration_no(dev, tmpbuf, 0);
+	err = usb_get_configuration_no(dev, tmpbuf, 0);
+	if (err < 0) {
+		printf("usb_new_device: Cannot read configuration, " \
+		       "skipping device %04x:%04x\n",
+		       dev->descriptor.idVendor, dev->descriptor.idProduct);
+		return -1;
+	}
 	usb_parse_config(dev, tmpbuf, 0);
 	usb_set_maxpacket(dev);
 	/* we set the default configuration here */