merge revision(s) a85ed626f18d1014d09fb37eb0a703976c3d2b53: [Backport #17731]

	Fix Enumerable#inject with high negative fixnums [Bug #17731]

	---
	 enum.c                 | 2 +-
	 test/ruby/test_enum.rb | 2 ++
	 2 files changed, 3 insertions(+), 1 deletion(-)

1 files changed, 1 insertions, 1 deletions

diff --git a/enum.c b/enum.c
index cc77964ff9..fb0ced57a1 100644
--- a/enum.c
+++ b/enum.c
@@ -771,7 +771,7 @@ ary_inject_op(VALUE ary, VALUE init, VALUE op)
                 if (FIXNUM_P(e)) {
                     n += FIX2LONG(e); /* should not overflow long type */
                     if (!FIXABLE(n)) {
-                        v = rb_big_plus(ULONG2NUM(n), v);
+                        v = rb_big_plus(LONG2NUM(n), v);
                         n = 0;
                     }
                 }