io.c (rb_io_syswrite): add RB_GC_GUARD

* io.c (rb_io_syswrite): add RB_GC_GUARD
  [Bug #9472][ruby-core:60407]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44790 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/io.c b/io.c
index 0020f4704a..1d9f87eb5f 100644
--- a/io.c
+++ b/io.c
@@ -4682,6 +4682,7 @@ rb_io_syswrite(VALUE io, VALUE str)
     }
 
     n = rb_write_internal(fptr->fd, RSTRING_PTR(str), RSTRING_LEN(str));
+    RB_GC_GUARD(str);
 
     if (n == -1) rb_sys_fail_path(fptr->pathv);