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Fix crash in _IO_wfile_sync (bug 20568)

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When computing the length of the converted part of the stdio buffer, use
the number of consumed wide characters, not the (negative) distance to the
end of the wide buffer.
This commit is contained in:
Andreas Schwab 2019-05-14 17:14:59 +02:00
parent a9368c34d7
commit 32ff397533
5 changed files with 57 additions and 3 deletions
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11
ChangeLog
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@ -1,3 +1,13 @@
2019-05-15 Andreas Schwab <schwab@suse.de>
[BZ #20568]
* libio/wfileops.c (_IO_wfile_sync): Correct last argument to
__codecvt_do_length.
* libio/Makefile (tests): Add tst-wfile-sync.
($(objpfx)tst-wfile-sync.out): Depend on $(gen-locales).
* libio/tst-wfile-sync.c: New file.
* libio/tst-wfile-sync.input: New file.
2019-05-15 Florian Weimer <fweimer@redhat.com>
nss: Turn __nss_database_lookup into a compatibility symbol.
@ -26,6 +36,7 @@
* sysdeps/posix/getaddrinfo.c (gaih_inet): Likewise.
2019-05-15 Alexandra Hajkova <ahajkova@redhat.com>
* support/support.h (support_install_rootsbindir): New variable.
* support/support_paths.c: Likewise.
* support/Makefile (CFLAGS-support_paths.c): Add -DROOTSBINDIR_PATH.

4
libio/Makefile
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@ -65,7 +65,8 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \
tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos tst-fseek \
tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler \
tst-ftell-append tst-fputws tst-bz22415 tst-fgetc-after-eof \
tst-sprintf-ub tst-sprintf-chk-ub tst-bz24051 tst-bz24153
tst-sprintf-ub tst-sprintf-chk-ub tst-bz24051 tst-bz24153 \
tst-wfile-sync
tests-internal = tst-vtables tst-vtables-interposed tst-readline
@ -212,6 +213,7 @@ $(objpfx)tst-ungetwc1.out: $(gen-locales)
$(objpfx)tst-ungetwc2.out: $(gen-locales)
$(objpfx)tst-widetext.out: $(gen-locales)
$(objpfx)tst_wprintf2.out: $(gen-locales)
$(objpfx)tst-wfile-sync.out: $(gen-locales)
endif
$(objpfx)test-freopen.out: test-freopen.sh $(objpfx)test-freopen

39
libio/tst-wfile-sync.c Normal file
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@ -0,0 +1,39 @@
/* Test that _IO_wfile_sync does not crash (bug 20568).
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 <stdio.h>
#include <wchar.h>
#include <support/check.h>
#include <support/xunistd.h>
static int
do_test (void)
{
TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
/* Fill the stdio buffer and advance the read pointer. */
TEST_VERIFY_EXIT (fgetwc (stdin) != WEOF);
/* This calls _IO_wfile_sync, it should not crash. */
TEST_VERIFY_EXIT (setvbuf (stdin, NULL, _IONBF, 0) == 0);
/* Verify that the external file offset has been synchronized. */
TEST_COMPARE (xlseek (0, 0, SEEK_CUR), 1);
return 0;
}
#include <support/test-driver.c>

1
libio/tst-wfile-sync.input Normal file
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@ -0,0 +1 @@
This is a test of _IO_wfile_sync.

5
libio/wfileops.c
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@ -508,11 +508,12 @@ _IO_wfile_sync (FILE *fp)
generate the wide characters up to the current reading
position. */
int nread;
size_t wnread = (fp->_wide_data->_IO_read_ptr
- fp->_wide_data->_IO_read_base);
fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state;
nread = (*cv->__codecvt_do_length) (cv, &fp->_wide_data->_IO_state,
fp->_IO_read_base,
fp->_IO_read_end, delta);
fp->_IO_read_end, wnread);
fp->_IO_read_ptr = fp->_IO_read_base + nread;
delta = -(fp->_IO_read_end - fp->_IO_read_base - nread);
}