usb: misc: iowarrior: fix information leak to userland

Structure iowarrior_info is copied to userland with padding byted
between "serial" and "revision" fields uninitialized. It leads to
leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <[e-mail]>
Cc: stable <[e-mail]>
Acked-by: Kees Cook <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/misc/iowarrior.c

···
 			/* needed for power consumption */
 			struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
 
+			memset(&info, 0, sizeof(info));
 			/* directly from the descriptor */
 			info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 			info.product = dev->product_id;