From: Ivan Maidanski <ivmai@mail.ru>
Date: Sat, 19 Aug 2017 15:22:37 +0000 (+0300)
Subject: Fix hb_n_marks underflow in clear_fl_marks if MARK_BIT_PER_OBJ
X-Git-Tag: v7.4.6~31
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8235b3f4fc8674c5886b058a52b89f530b9944b4;p=gc

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).
---

diff --git a/mark.c b/mark.c
index a03addac..e58ed0d2 100644
--- a/mark.c
+++ b/mark.c
@@ -172,7 +172,7 @@ 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