From f6e3d2ae6a02ae0659942386fe048f4156f844a5 Mon Sep 17 00:00:00 2001
From: Ivan Maidanski <ivmai@mail.ru>
Date: Sat, 19 Aug 2017 18:22:37 +0300
Subject: [PATCH] Fix hb_n_marks underflow in clear_fl_marks if
 MARK_BIT_PER_OBJ

Issue #177 (bdwgc).

* mark.c [MARK_BIT_PER_OBJ] (GC_set_hdr_marks): Set hhdr->hb_n_marks
exactly to n_marks value (without a decrement by one).
---
 mark.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mark.c b/mark.c
index 33f2fba..0fba5b8 100644
--- a/mark.c
+++ b/mark.c
@@ -166,7 +166,7 @@ GC_INNER void GC_set_hdr_marks(hdr *hhdr)
       }
 #   endif
 #   ifdef MARK_BIT_PER_OBJ
-      hhdr -> hb_n_marks = n_marks - 1;
+      hhdr -> hb_n_marks = n_marks;
 #   else
       hhdr -> hb_n_marks = HBLK_OBJS(sz);
 #   endif
-- 
2.7.4