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Fix hbp overflow in GC_install_counts

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Issue #245 (bdwgc).

The overflow resulted in an infinite loop in GC_install_counts on Win32.

* headers.c (GC_install_counts): If hbp+=BOTTOM_SZ overflow is expected
then break the first loop.
This commit is contained in:
Ivan Maidanski
2018-11-04 11:59:11 +03:00
parent d29c77c46d
commit 6a32bb4cf8
1 changed files with 2 additions and 0 deletions
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headers.c
+2
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@@ -284,6 +284,8 @@ GC_INNER GC_bool GC_install_counts(struct hblk *h, size_t sz/* bytes */)
for (hbp = h; (word)hbp < (word)h + sz; hbp += BOTTOM_SZ) {
if (!get_index((word) hbp)) return(FALSE);
if ((word)hbp > (~(word)0) - (word)BOTTOM_SZ * HBLKSIZE)
break; /* overflow */
}
if (!get_index((word)h + sz - 1)) return(FALSE);
for (hbp = h + 1; (word)hbp < (word)h + sz; hbp += 1) {