mirror of
https://sourceware.org/git/glibc.git
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d653fd2d9e
This addresses more (correct) use-after-free warnings reported by
GCC 12 on some targets.
Fixes commit c094c232eb ("Avoid
-Wuse-after-free in tests [BZ #26779].").
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
150 lines
3.5 KiB
C
150 lines
3.5 KiB
C
/* Copyright (C) 2013-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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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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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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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <malloc.h>
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#include <stdio.h>
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#include <string.h>
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#include <libc-diag.h>
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#include <support/check.h>
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static int
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do_test (void)
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{
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void *p;
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unsigned char *c;
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int save, i, ok;
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errno = 0;
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/* realloc (NULL, ...) behaves similarly to malloc (C89). */
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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/* GCC 7 warns about too-large allocations; here we want to test
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that they fail. */
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DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
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#endif
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p = realloc (NULL, -1);
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DIAG_POP_NEEDS_COMMENT;
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save = errno;
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if (p != NULL)
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FAIL_EXIT1 ("realloc (NULL, -1) succeeded.");
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/* errno should be set to ENOMEM on failure (POSIX). */
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if (p == NULL && save != ENOMEM)
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FAIL_EXIT1 ("errno is not set correctly");
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errno = 0;
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/* realloc (NULL, ...) behaves similarly to malloc (C89). */
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p = realloc (NULL, 10);
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save = errno;
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if (p == NULL)
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FAIL_EXIT1 ("realloc (NULL, 10) failed.");
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free (p);
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p = calloc (20, 1);
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if (p == NULL)
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FAIL_EXIT1 ("calloc (20, 1) failed.");
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/* Check increasing size preserves contents (C89). */
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p = realloc (p, 200);
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if (p == NULL)
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FAIL_EXIT1 ("realloc (p, 200) failed.");
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c = p;
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ok = 1;
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for (i = 0; i < 20; i++)
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{
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if (c[i] != 0)
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ok = 0;
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}
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if (ok == 0)
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FAIL_EXIT1 ("first 20 bytes were not cleared");
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free (p);
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p = realloc (NULL, 100);
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if (p == NULL)
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FAIL_EXIT1 ("realloc (NULL, 100) failed.");
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memset (p, 0xff, 100);
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/* Check decreasing size preserves contents (C89). */
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p = realloc (p, 16);
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if (p == NULL)
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FAIL_EXIT1 ("realloc (p, 16) failed.");
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c = p;
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ok = 1;
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for (i = 0; i < 16; i++)
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{
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if (c[i] != 0xff)
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ok = 0;
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}
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if (ok == 0)
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FAIL_EXIT1 ("first 16 bytes were not correct");
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/* Check failed realloc leaves original untouched (C89). */
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DIAG_PUSH_NEEDS_COMMENT;
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#if __GNUC_PREREQ (7, 0)
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/* GCC 7 warns about too-large allocations; here we want to test
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that they fail. */
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DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
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#endif
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c = realloc (p, -1);
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DIAG_POP_NEEDS_COMMENT;
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if (c != NULL)
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FAIL_EXIT1 ("realloc (p, -1) succeeded.");
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c = p;
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ok = 1;
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for (i = 0; i < 16; i++)
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{
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if (c[i] != 0xff)
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ok = 0;
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}
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if (ok == 0)
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FAIL_EXIT1 ("first 16 bytes were not correct after failed realloc");
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/* realloc (p, 0) frees p (C89) and returns NULL (glibc). */
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p = realloc (p, 0);
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if (p != NULL)
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FAIL_EXIT1 ("realloc (p, 0) returned non-NULL.");
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/* realloc (NULL, 0) acts like malloc (0) (glibc). */
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p = realloc (NULL, 0);
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if (p == NULL)
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FAIL_EXIT1 ("realloc (NULL, 0) returned NULL.");
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free (p);
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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