diff options
author | Andreas Schwab <schwab@suse.de> | 2019-05-15 17:09:05 +0200 |
---|---|---|
committer | Florian Weimer <fweimer@redhat.com> | 2019-05-15 17:09:05 +0200 |
commit | c6177be4b92d5d7df50a785652d1912db511423e (patch) | |
tree | 1e42378e4cd189b3111abc13783886fd03444973 /libio | |
parent | 52b7cd6e9a701bb203023d56e84551943dc6a4c0 (diff) | |
download | glibc-c6177be4b92d5d7df50a785652d1912db511423e.zip glibc-c6177be4b92d5d7df50a785652d1912db511423e.tar.gz glibc-c6177be4b92d5d7df50a785652d1912db511423e.tar.bz2 |
Fix crash in _IO_wfile_sync (bug 20568)
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.
(cherry picked from commit 32ff397533715988c19cbf3675dcbd727ec13e18)
Diffstat (limited to 'libio')
-rw-r--r-- | libio/Makefile | 3 | ||||
-rw-r--r-- | libio/tst-wfile-sync.c | 39 | ||||
-rw-r--r-- | libio/tst-wfile-sync.input | 1 | ||||
-rw-r--r-- | libio/wfileops.c | 5 |
4 files changed, 45 insertions, 3 deletions
diff --git a/libio/Makefile b/libio/Makefile index 5bee83e..ee3a34c 100644 --- a/libio/Makefile +++ b/libio/Makefile @@ -65,7 +65,7 @@ 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-sprintf-ub tst-sprintf-chk-ub tst-wfile-sync tests-internal = tst-vtables tst-vtables-interposed tst-readline @@ -212,6 +212,7 @@ $(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 diff --git a/libio/tst-wfile-sync.c b/libio/tst-wfile-sync.c new file mode 100644 index 0000000..6186820 --- /dev/null +++ b/libio/tst-wfile-sync.c @@ -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> diff --git a/libio/tst-wfile-sync.input b/libio/tst-wfile-sync.input new file mode 100644 index 0000000..12d0958 --- /dev/null +++ b/libio/tst-wfile-sync.input @@ -0,0 +1 @@ +This is a test of _IO_wfile_sync. diff --git a/libio/wfileops.c b/libio/wfileops.c index 78f2048..bab2ba4 100644 --- a/libio/wfileops.c +++ b/libio/wfileops.c @@ -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); } |