usb: misc: sisusbvga: fix information leak to userland

Structure sisusb_info is copied to userland with "sisusb_reserved" field
uninitialized. It leads to leaking of contents of kernel stack memory.

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

drivers/usb/misc/sisusbvga/sisusb.c

···
 #else
 			x.sisusb_conactive  = 0;
 #endif
+			memset(x.sisusb_reserved, 0, sizeof(x.sisusb_reserved));
 
 			if (copy_to_user((void __user *)arg, &x, sizeof(x)))
 				retval = -EFAULT;