net: genetlink: return the error code when attribute parsing fails.

Currently if attribute parsing fails and the genl family
does not support parallel operation, the error code returned
by __nlmsg_parse() is discarded by genl_family_rcv_msg_attrs_parse().

Be sure to report the error for all genl families.

Fixes: c10e6cf85e7d ("net: genetlink: push attrbuf allocation and parsing to a separate function")
Fixes: ab5b526da048 ("net: genetlink: always allocate separate attrs for dumpit ops")
Signed-off-by: Paolo Abeni <[e-mail]>
Reviewed-by: Jiri Pirko <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/netlink/genetlink.c

···
 
 	err = __nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
 			    family->policy, validate, extack);
-	if (err && parallel) {
-		kfree(attrbuf);
+	if (err) {
+		if (parallel)
+			kfree(attrbuf);
 		return ERR_PTR(err);
 	}
 	return attrbuf;