===================================================================
RCS file: /cvs/mandoc/dbm_map.c,v
retrieving revision 1.4
retrieving revision 1.5
diff -u -p -r1.4 -r1.5
--- mandoc/dbm_map.c	2016/08/22 16:07:16	1.4
+++ mandoc/dbm_map.c	2016/08/30 21:37:24	1.5
@@ -1,4 +1,4 @@
-/*	$Id: dbm_map.c,v 1.4 2016/08/22 16:07:16 schwarze Exp $ */
+/*	$Id: dbm_map.c,v 1.5 2016/08/30 21:37:24 schwarze Exp $ */
 /*
  * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
  *
@@ -143,7 +143,11 @@ void *
 dbm_get(int32_t offset)
 {
 	offset = be32toh(offset);
-	if (offset < 0 || offset >= max_offset) {
+	if (offset < 0) {
+		warnx("dbm_get: Database corrupt: offset %d", offset);
+		return NULL;
+	}
+	if (offset >= max_offset) {
 		warnx("dbm_get: Database corrupt: offset %d > %d",
 		    offset, max_offset);
 		return NULL;