* io.c (io_read): should freeze buffer before thread context

  switch. [ruby-dev:24442]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@7011 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 4 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index 0085a8dd5b..3ca3465f90 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 Thu Oct  7 12:55:04 2004  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
+	* io.c (io_read): should freeze buffer before thread context
+	  switch. [ruby-dev:24442]
+
 	* pack.c (pack_unpack): string conversion should at the top of the
 	  method.  [ruby-dev:24439]
 
diff --git a/io.c b/io.c
index ffff98f9e4..186fabfd0f 100644
--- a/io.c
+++ b/io.c
@@ -1070,8 +1070,8 @@ io_read(argc, argv, io)
     }
     if (len == 0) return str;
 
-    READ_CHECK(fptr->f);
     FL_SET(str, FL_FREEZE);
+    READ_CHECK(fptr->f);
     n = rb_io_fread(RSTRING(str)->ptr, len, fptr->f);
     FL_UNSET(str, FL_FREEZE);
     if (n == 0) {