load.c: avoid segfault when 'throw' occurs in the middle of rb_load_file_str

How can a 'throw' happen while the current thread is reading a Ruby source file
from disk and parsing it? It can happen if another thread calls Thread#raise,
and passes an Exception object which responds to #exception, and the custom #exception
method calls Kernel#throw.

In practice, this is most likely to happen if you combine the use of autoload and
Timeout.timeout.

An extra check is required to avoid a segfault in this case.

* load.c (rb_load_internal0): extra check before returning TAG_RAISE when a
  non-local transfer of control happens while loading and parsing a Ruby source file.
  [ruby-core:70169] [Bug #11404]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51439 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/load.c b/load.c
index fbe75913bf..54f7307e4c 100644
--- a/load.c
+++ b/load.c
@@ -621,7 +621,7 @@ rb_load_internal0(rb_thread_t *th, VALUE fname, int wrap)
     th->top_self = self;
     th->top_wrapper = wrapper;
 
-    if (!loaded && !FIXNUM_P(th->errinfo)) {
+    if (!loaded && !FIXNUM_P(th->errinfo) && state != TAG_THROW) {
 	/* an error on loading don't include INT2FIX(TAG_FATAL) see r35625 */
 	return TAG_RAISE;
     }