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edc696a73a
The _IO_wfile_overflow does not check if the write pointer for wide
data is valid before access, different than _IO_file_overflow. This
leads to crash on some cases, as described by bug 28828.
The minimal sequence to produce the crash was:
#include <stdio.h>
#include <wchar.h>
int main (int ac, char **av)
{
setvbuf (stdout, NULL, _IOLBF, 0);
fgetwc (stdin);
fputwc (10, stdout); /*CRASH HERE!*/
return 0;
}
The "fgetwc(stdin);" is necessary since it triggers the bug by setting
the flag _IO_CURRENTLY_PUTTING on stdout indirectly (file wfileops.c,
function _IO_wfile_underflow, line 213).
Signed-off-by: Jose Bollo <jobol@nonadev.net>
33 lines
1.0 KiB
C
33 lines
1.0 KiB
C
/* Unit test for BZ#28828.
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Copyright (C) 2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/xstdio.h>
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#include <support/check.h>
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#include <wchar.h>
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static int
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do_test (void)
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{
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setvbuf (stdout, NULL, _IOLBF, 0);
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fgetwc (stdin);
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fputwc (10, stdout); /* It should not crash here. */
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return 0;
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}
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#include <support/test-driver.c>
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