libio: Fix gconv-related memory leak [BZ #24583]

struct gconv_fcts for the C locale is statically allocated,
and __gconv_close_transform deallocates the steps object.
Therefore this commit introduces __wcsmbs_close_conv to avoid
freeing the statically allocated steps objects.

1 files changed, 36 insertions, 0 deletions

diff --git a/libio/tst-wfile-gconv.c b/libio/tst-wfile-gconv.c
new file mode 100644
index 0000000..de603b3
--- /dev/null
+++ b/libio/tst-wfile-gconv.c
@@ -0,0 +1,36 @@
+/* Test that non-built-in gconv modules do not cause memory leak (bug 24583).
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <locale.h>
+#include <mcheck.h>
+#include <support/check.h>
+#include <support/xstdio.h>
+
+static int
+do_test (void)
+{
+  mtrace ();
+
+  TEST_VERIFY_EXIT (setlocale (LC_ALL, "ja_JP.EUC-JP") != NULL);
+  xfclose (xfopen ("/etc/passwd", "r,ccs=UTF-8"));
+  xfclose (xfopen ("/etc/passwd", "r"));
+
+  return 0;
+}
+
+#include <support/test-driver.c>