* array.c (rb_ary_count): check length to avoid SEGV

  while iterating. Remove other pointer loop when arg is given.
* test/ruby/test_array.rb (test_count): add test for bug.
  [ruby-core:56072] [Bug #8654]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42041 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 22 insertions, 5 deletions

diff --git a/ChangeLog b/ChangeLog
index ed5850d975..517f376642 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Thu Jul 18 20:35:14 2013  Benoit Daloze  <eregontp@gmail.com>
+
+	* array.c (rb_ary_count): check length to avoid SEGV
+	  while iterating. Remove other pointer loop when arg is given.
+
+	* test/ruby/test_array.rb (test_count): add test for bug.
+	  [ruby-core:56072] [Bug #8654]
+
 Thu Jul 18 18:14:36 2013  Masaki Matsushita  <glass.saga@gmail.com>
 
 	* array.c (rb_ary_count): iterate items appropriately.
diff --git a/array.c b/array.c
index ef9007ae0d..0cd2f0d91a 100644
--- a/array.c
+++ b/array.c
@@ -4174,10 +4174,9 @@ rb_ary_compact(VALUE ary)
 static VALUE
 rb_ary_count(int argc, VALUE *argv, VALUE ary)
 {
-    long n = 0;
+    long i, n = 0;
 
     if (argc == 0) {
-	long i;
 	VALUE v;
 
 	if (!rb_block_given_p())
@@ -4189,14 +4188,14 @@ rb_ary_count(int argc, VALUE *argv, VALUE ary)
 	}
     }
     else {
-	VALUE obj, *p, *pend;
+	VALUE obj;
 
 	rb_scan_args(argc, argv, "1", &obj);
 	if (rb_block_given_p()) {
 	    rb_warn("given block not used");
 	}
-	for (p = RARRAY_PTR(ary), pend = p + RARRAY_LEN(ary); p < pend; p++) {
-	    if (rb_equal(*p, obj)) n++;
+	for (i = 0; i < RARRAY_LEN(ary); i++) {
+	    if (rb_equal(RARRAY_AREF(ary, i), obj)) n++;
 	}
     }
 
diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index 93ef59a3f5..b158db0ec9 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -572,6 +572,16 @@ class TestArray < Test::Unit::TestCase
     assert_equal(3, a.count {|x| x % 2 == 1 })
     assert_equal(2, a.count(1) {|x| x % 2 == 1 })
     assert_raise(ArgumentError) { a.count(0, 1) }
+
+    bug8654 = '[ruby-core:56072]'
+    assert_in_out_err [], <<-EOS, ["0"], [], bug8654
+      a1 = []
+      a2 = Array.new(100) { |i| i }
+      r = a2.count do |i|
+        p i
+        a2.replace(a1) if i == 0
+      end
+    EOS
   end
 
   def test_delete