merge revision(s) 54465: [Backport #12237]

	* thread.c (update_coverage): Do not track coverage in loaded files
	  after Coverage.result. Avoids out-of-bounds access. [Bug #12237]

	* ext/coverage/coverage.c (coverage_clear_result_i): document.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54632 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/thread.c b/thread.c
index c2ce8274e5..4e0340d801 100644
--- a/thread.c
+++ b/thread.c
@@ -4768,7 +4768,7 @@ update_coverage(rb_event_flag_t event, VALUE proc, VALUE self, ID id, VALUE klas
     if (coverage && RBASIC(coverage)->klass == 0) {
 	long line = rb_sourceline() - 1;
 	long count;
-	if (RARRAY_AREF(coverage, line) == Qnil) {
+	if (line >= RARRAY_LEN(coverage)) { /* no longer tracked */
 	    return;
 	}
 	count = FIX2LONG(RARRAY_AREF(coverage, line)) + 1;