Fix handling of collating elements in fnmatch (bug 17396, bug 16976)

This fixes the same bug in fnmatch that was fixed by commit 7e2f0d2d77 for
regexp matching.  As a side effect it also removes the use of an unbound
VLA.

1 files changed, 46 insertions, 0 deletions

diff --git a/posix/tst-fnmatch5.c b/posix/tst-fnmatch5.c
new file mode 100644
index 0000000..241371c
--- /dev/null
+++ b/posix/tst-fnmatch5.c
@@ -0,0 +1,46 @@
+/* Test for fnmatch handling of collating elements
+   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 <fnmatch.h>
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <support/check.h>
+
+#define LENGTH 20000000
+
+static char pattern[LENGTH + 7];
+
+static int
+do_test (void)
+{
+  TEST_VERIFY_EXIT (setlocale (LC_ALL, "en_US.UTF-8") != NULL);
+
+  pattern[0] = '[';
+  pattern[1] = '[';
+  pattern[2] = '.';
+  memset (pattern + 3, 'a', LENGTH);
+  pattern[LENGTH + 3] = '.';
+  pattern[LENGTH + 4] = ']';
+  pattern[LENGTH + 5] = ']';
+  TEST_VERIFY (fnmatch (pattern, "a", 0) != 0);
+
+  return 0;
+}
+
+#include <support/test-driver.c>