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libio: handle opening a file when all files are closed (bug 31963)

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_IO_list_all becomes NULL when all files (including standard files) are
closed.
This commit is contained in:
Andreas Schwab 2024-07-08 15:52:35 +02:00
parent 895294e51d
commit 2213b37b70
3 changed files with 37 additions and 1 deletions
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1
libio/Makefile
View File

@ -91,6 +91,7 @@ tests = \
tst-bz24051 \ tst-bz24051 \
tst-bz24153 \ tst-bz24153 \
tst-bz28828 \ tst-bz28828 \
tst-closeall \
tst-eof \ tst-eof \
tst-ext \ tst-ext \
tst-ext2 \ tst-ext2 \

3
libio/genops.c
View File

@ -119,7 +119,8 @@ _IO_link_in (struct _IO_FILE_plus *fp)
if (_IO_vtable_offset ((FILE *) fp) == 0) if (_IO_vtable_offset ((FILE *) fp) == 0)
{ {
fp->file._prevchain = (FILE **) &_IO_list_all; fp->file._prevchain = (FILE **) &_IO_list_all;
_IO_list_all->file._prevchain = &fp->file._chain; if (_IO_list_all != NULL)
_IO_list_all->file._prevchain = &fp->file._chain;
} }
_IO_list_all = fp; _IO_list_all = fp;
#ifdef _IO_MTSAFE_IO #ifdef _IO_MTSAFE_IO

34
libio/tst-closeall.c Normal file
View File

@ -0,0 +1,34 @@
/* Test that opening a file when all files are closed does not crash (bug 31963)
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 <support/check.h>
#include <support/xstdio.h>
static int
do_test (void)
{
xfclose (stdin);
xfclose (stdout);
xfclose (stderr);
FILE *f = xfopen ("/dev/null", "w");
fprintf (f, "final\n");
xfclose (f);
return 0;
}
#include <support/test-driver.c>