diff options
| -rw-r--r-- | libio/Makefile | 1 | ||||
| -rw-r--r-- | libio/tst-fclose-unopened.c | 40 |
2 files changed, 41 insertions, 0 deletions
diff --git a/libio/Makefile b/libio/Makefile index 6a507b67ea..59f3ee0b7c 100644 --- a/libio/Makefile +++ b/libio/Makefile @@ -95,6 +95,7 @@ tests = \ tst-eof \ tst-ext \ tst-ext2 \ + tst-fclose-unopened \ tst-fdopen-seek-failure \ tst-fgetc-after-eof \ tst-fgetwc \ diff --git a/libio/tst-fclose-unopened.c b/libio/tst-fclose-unopened.c new file mode 100644 index 0000000000..1f1cad042d --- /dev/null +++ b/libio/tst-fclose-unopened.c @@ -0,0 +1,40 @@ +/* Test using fclose on an unopened file. + Copyright (C) 2024 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 + <https://www.gnu.org/licenses/>. */ + +#include <stdio.h> +#include <support/check.h> + +/* Verify that fclose on an unopened file returns EOF. This is not part + of the fclose external contract but there are dependancies on this + behaviour. */ + +static int +do_test (void) +{ + TEST_COMPARE (fclose (stdin), 0); + + /* Attempt to close the unopened file and verify that EOF is returned. + Calling fclose on a file twice normally causes a use-after-free bug, + however the standard streams are an exception since they are not + deallocated by fclose. */ + TEST_COMPARE (fclose (stdin), EOF); + + return 0; +} + +#include <support/test-driver.c> |