Re: [PATCH net-next v3] em_canid: Ematch rule to match CAN frames according to their identifiers

One more simplification:

quoted

+	rulescnt = len / sizeof(struct can_filter);
+
+	cm = kzalloc(sizeof(struct canid_match) + sizeof(struct can_filter) *
+		rulescnt, GFP_KERNEL);

No need to multiply the value again  ... you can take the len value as-is:

cm = kzalloc(sizeof(struct canid_match) + len, GFP_KERNEL);

*cm is no longer a fixed structure as it was in the first patches.

Must be:

m->datalen = sizeof(struct canid_match) + sizeof(struct can_filter) * rulescnt

dito:

m->datalen = sizeof(struct canid_match) + len;

Regards,
Oliver