3 files changed, 16 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index 53592da0b7..e1ba173249 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Oct  3 18:30:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (rb_intern): should check symbol table overflow.
+	 #3900 [ruby-dev:42330]
+
 Fri Oct  1 15:12:05 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* win32/win32.c (init_stdhandle): redirect unopened IOs to NUL.
diff --git a/parse.y b/parse.y
index 9f14466816..df19699c0d 100644
--- a/parse.y
+++ b/parse.y
@@ -6222,6 +6222,16 @@ rb_intern(name)
     }
     if (*m) id = ID_JUNK;
   new_id:
+    if (last_id >= SYM2ID(~(VALUE)0) >> ID_SCOPE_SHIFT) {
+	if (last > 20) {
+	    rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %.20s...)",
+		     name);
+	}
+	else {
+	    rb_raise(rb_eRuntimeError, "symbol table overflow (symbol %.*s)",
+		     last, name);
+	}
+    }
     id |= ++last_id << ID_SCOPE_SHIFT;
   id_regist:
     name = strdup(name);
diff --git a/version.h b/version.h
index 550fdd8001..d290abc596 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 #define RUBY_RELEASE_DATE "2010-11-22"
 #define RUBY_VERSION_CODE 187
 #define RUBY_RELEASE_CODE 20101122
-#define RUBY_PATCHLEVEL 312
+#define RUBY_PATCHLEVEL 313
 
 #define RUBY_VERSION_MAJOR 1
 #define RUBY_VERSION_MINOR 8