quoted

      if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
-             u32 *filter_mask = kzalloc(32, GFP_KERNEL);
+             u32 *filter_mask = kzalloc(sizeof(u32) * 32, GFP_KERNEL);

It's also unchecked for alloc failure.

Thanks both, I've resubmitted with an alloc failure check,

I completely agree - that filter code isn't pretty!  If you have time
to knock up a patch I'd be happy to test it.

Steve