re PR libstdc++/82558 (V8 JavaScript engine segfaults since r249235)

2017-10-16  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/82558
	* include/bits/stl_bvector.h (fill): Add iterator offset check.
	* testsuite/23_containers/vector/bool/82558.cc: New.

From-SVN: r253776

libstdc++-v3/ChangeLog

+2017-10-16  François Dumont  <fdumont@gcc.gnu.org>
+
+	PR libstdc++/82558
+	* include/bits/stl_bvector.h (fill): Add iterator offset check.
+	* testsuite/23_containers/vector/bool/82558.cc: New.
+
 2017-10-13  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/82522

libstdc++-v3/include/bits/stl_bvector.h

@@ -417,7 +417,7 @@ _GLIBCXX_BEGIN_NAMESPACE_CONTAINER
 	if (__last._M_offset != 0)
 	  __fill_bvector(__last._M_p, 0, __last._M_offset, __x);
       }
-    else
+    else if (__first._M_offset != __last._M_offset)
       __fill_bvector(__first._M_p, __first._M_offset, __last._M_offset, __x);
   }
 

libstdc++-v3/testsuite/23_containers/vector/bool/82558.cc

+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 23.3.8  class vector<bool>
+
+#include <vector>
+
+// libstdc++/82558
+void test01()
+{
+  std::vector<bool> v;
+  std::fill(v.begin(), v.begin(), false);
+}
+
+int main()
+{
+  test01();
+}