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commit 32ff397533715988c19cbf3675dcbd727ec13e18
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Author: Andreas Schwab <schwab@suse.de>
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Date: Tue May 14 17:14:59 2019 +0200
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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
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the number of consumed wide characters, not the (negative) distance to the
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end of the wide buffer.
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Conflicts:
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libio/Makefile
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(Usual conflict when adding tests due to missing backports.)
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diff --git a/libio/Makefile b/libio/Makefile
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index cab0eae946b1f307..cbfaf3832a45fc22 100644
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--- a/libio/Makefile
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+++ b/libio/Makefile
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@@ -64,7 +64,8 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \
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bug-memstream1 bug-wmemstream1 \
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tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos tst-fseek \
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tst-fwrite-error tst-ftell-partial-wide tst-ftell-active-handler \
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- tst-ftell-append tst-fputws tst-bz22415 tst-fgetc-after-eof
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+ tst-ftell-append tst-fputws tst-bz22415 tst-fgetc-after-eof \
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+ tst-wfile-sync
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tests-internal = tst-vtables tst-vtables-interposed tst-readline
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@@ -207,6 +208,7 @@ $(objpfx)tst-ungetwc1.out: $(gen-locales)
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$(objpfx)tst-ungetwc2.out: $(gen-locales)
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$(objpfx)tst-widetext.out: $(gen-locales)
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$(objpfx)tst_wprintf2.out: $(gen-locales)
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+$(objpfx)tst-wfile-sync.out: $(gen-locales)
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endif
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$(objpfx)test-freopen.out: test-freopen.sh $(objpfx)test-freopen
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diff --git a/libio/tst-wfile-sync.c b/libio/tst-wfile-sync.c
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new file mode 100644
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index 0000000000000000..618682064da4035c
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--- /dev/null
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+++ b/libio/tst-wfile-sync.c
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@@ -0,0 +1,39 @@
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+/* Test that _IO_wfile_sync does not crash (bug 20568).
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+ Copyright (C) 2019 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <locale.h>
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+#include <stdio.h>
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+#include <wchar.h>
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+#include <support/check.h>
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+#include <support/xunistd.h>
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+
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+static int
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+do_test (void)
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+{
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+ TEST_VERIFY_EXIT (setlocale (LC_ALL, "de_DE.UTF-8") != NULL);
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+ /* Fill the stdio buffer and advance the read pointer. */
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+ TEST_VERIFY_EXIT (fgetwc (stdin) != WEOF);
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+ /* This calls _IO_wfile_sync, it should not crash. */
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+ TEST_VERIFY_EXIT (setvbuf (stdin, NULL, _IONBF, 0) == 0);
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+ /* Verify that the external file offset has been synchronized. */
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+ TEST_COMPARE (xlseek (0, 0, SEEK_CUR), 1);
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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diff --git a/libio/tst-wfile-sync.input b/libio/tst-wfile-sync.input
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new file mode 100644
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index 0000000000000000..12d0958f7aaa3865
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--- /dev/null
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+++ b/libio/tst-wfile-sync.input
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@@ -0,0 +1 @@
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+This is a test of _IO_wfile_sync.
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diff --git a/libio/wfileops.c b/libio/wfileops.c
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index 63cb687652c72ce1..10e7343f8fdb8781 100644
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--- a/libio/wfileops.c
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+++ b/libio/wfileops.c
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@@ -508,11 +508,12 @@ _IO_wfile_sync (FILE *fp)
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generate the wide characters up to the current reading
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position. */
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int nread;
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-
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+ size_t wnread = (fp->_wide_data->_IO_read_ptr
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+ - fp->_wide_data->_IO_read_base);
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fp->_wide_data->_IO_state = fp->_wide_data->_IO_last_state;
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nread = (*cv->__codecvt_do_length) (cv, &fp->_wide_data->_IO_state,
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fp->_IO_read_base,
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- fp->_IO_read_end, delta);
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+ fp->_IO_read_end, wnread);
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fp->_IO_read_ptr = fp->_IO_read_base + nread;
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delta = -(fp->_IO_read_end - fp->_IO_read_base - nread);
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}
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