===================================================================
RCS file: /cvs/mandoc/dbm_map.c,v
retrieving revision 1.4
retrieving revision 1.7
diff -u -p -r1.4 -r1.7
--- mandoc/dbm_map.c	2016/08/22 16:07:16	1.4
+++ mandoc/dbm_map.c	2016/10/22 10:09:27	1.7
@@ -1,4 +1,4 @@
-/*	$Id: dbm_map.c,v 1.4 2016/08/22 16:07:16 schwarze Exp $ */
+/*	$Id: dbm_map.c,v 1.7 2016/10/22 10:09:27 schwarze Exp $ */
 /*
  * Copyright (c) 2016 Ingo Schwarze <schwarze@openbsd.org>
  *
@@ -100,8 +100,8 @@ dbm_map(const char *fname)
 	}
 	max_offset = be32toh(*dbm_getint(3)) + sizeof(int32_t);
 	if (st.st_size != max_offset) {
-		warnx("dbm_map(%s): Inconsistent file size %llu (expected %d)",
-		    fname, st.st_size, max_offset);
+		warnx("dbm_map(%s): Inconsistent file size %lld (expected %d)",
+		    fname, (long long)st.st_size, max_offset);
 		errno = EFTYPE;
 		goto fail;
 	}
@@ -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;