aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorAndreas Schwab <schwab@suse.de>2019-05-14 17:14:59 +0200
committerAndreas Schwab <schwab@suse.de>2019-05-15 16:47:09 +0200
commit32ff397533715988c19cbf3675dcbd727ec13e18 (patch)
treefb529b404d7136b24968ebbf8618af9ea13c7b79
parenta9368c34d70cef91ca59b09941f496df11d6b146 (diff)
downloadglibc-32ff397533715988c19cbf3675dcbd727ec13e18.tar.gz
glibc-32ff397533715988c19cbf3675dcbd727ec13e18.tar.xz
glibc-32ff397533715988c19cbf3675dcbd727ec13e18.zip
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.
-rw-r--r--ChangeLog11
-rw-r--r--libio/Makefile4
-rw-r--r--libio/tst-wfile-sync.c39
-rw-r--r--libio/tst-wfile-sync.input1
-rw-r--r--libio/wfileops.c5
5 files changed, 57 insertions, 3 deletions
diff --git a/ChangeLog b/ChangeLog
index c01a2fdc514..ce2b74938e1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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.
diff --git a/libio/Makefile b/libio/Makefile
index 95b91084ddd..a5236c7042a 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -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
diff --git a/libio/tst-wfile-sync.c b/libio/tst-wfile-sync.c
new file mode 100644
index 00000000000..618682064da
--- /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 00000000000..12d0958f7aa
--- /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 03676437035..69fbb62a02c 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);
}