bgpd: Don't read the first byte of ORF header if we are ahead of stream

Reported-by: Iggy Frankovic iggyfran@amazon.com
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
(cherry picked from commit 9b855a6)

bgpd/bgp_packet.c

@@ -2408,7 +2408,8 @@ static int bgp_route_refresh_receive(struct peer *peer, bgp_size_t size)
 				 * and 7 bytes of ORF Address-filter entry from
 				 * the stream
 				 */
-				if (*p_pnt & ORF_COMMON_PART_REMOVE_ALL) {
+				if (p_pnt < p_end &&
+				    *p_pnt & ORF_COMMON_PART_REMOVE_ALL) {
 					if (bgp_debug_neighbor_events(peer))
 						zlog_debug(
 							"%pBP rcvd Remove-All pfxlist ORF request",