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getdelim: ensure error indicator is set on error (bug 29917)

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POSIX requires that getdelim and getline set the error indicator on the
stream when an error occured, in addition to setting errno.
This commit is contained in:
Andreas Schwab 2022-12-19 12:40:45 +01:00
parent 289b098c9e
commit a09183aed7
3 changed files with 48 additions and 6 deletions
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2
libio/Makefile
View File

@ -66,7 +66,7 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc \
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-wfile-sync tst-bz28828
tst-wfile-sync tst-bz28828 tst-getdelim
tests-internal = tst-vtables tst-vtables-interposed

16
libio/iogetdelim.c
View File

@ -43,11 +43,6 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
ssize_t cur_len = 0;
ssize_t len;
if (lineptr == NULL || n == NULL)
{
__set_errno (EINVAL);
return -1;
}
CHECK_FILE (fp, -1);
_IO_acquire_lock (fp);
if (_IO_ferror_unlocked (fp))
@ -56,12 +51,21 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
goto unlock_return;
}
if (lineptr == NULL || n == NULL)
{
__set_errno (EINVAL);
fseterr_unlocked (fp);
result = -1;
goto unlock_return;
}
if (*lineptr == NULL || *n == 0)
{
*n = 120;
*lineptr = (char *) malloc (*n);
if (*lineptr == NULL)
{
fseterr_unlocked (fp);
result = -1;
goto unlock_return;
}
@ -88,6 +92,7 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
if (__glibc_unlikely (len >= SSIZE_MAX - cur_len))
{
__set_errno (EOVERFLOW);
fseterr_unlocked (fp);
result = -1;
goto unlock_return;
}
@ -102,6 +107,7 @@ __getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
new_lineptr = (char *) realloc (*lineptr, needed);
if (new_lineptr == NULL)
{
fseterr_unlocked (fp);
result = -1;
goto unlock_return;
}

36
libio/tst-getdelim.c Normal file
View File

@ -0,0 +1,36 @@
/* Check that getdelim sets error indicator on error (BZ #29917)
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <errno.h>
#include <support/check.h>
static int
do_test (void)
{
clearerr (stdin);
TEST_VERIFY (getdelim (0, 0, '\n', stdin) == -1);
TEST_VERIFY (ferror (stdin) != 0);
TEST_VERIFY (errno == EINVAL);
return 0;
}
#include <support/test-driver.c>