1/* Test that malloc tcache catches double free.
2 Copyright (C) 2018-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <error.h>
21#include <limits.h>
22#include <malloc.h>
23#include <stdlib.h>
24#include <stdio.h>
25#include <sys/signal.h>
26
27static int
28do_test (void)
29{
30#define COUNT 20
31 char * volatile ptrs[COUNT];
32 int i;
33
34 /* Allocate enough small chunks so that when we free them all, the tcache
35 is full, and the first one we freed is at the end of its linked list. */
36 for (i = 0; i < COUNT; i++)
37 ptrs[i] = malloc (size: 20);
38 for (i = 0; i < COUNT; i++)
39 free (ptr: ptrs[i]);
40 free (ptr: ptrs[0]);
41
42 printf(format: "FAIL: tcache double free\n");
43 return 1;
44}
45
46#define TEST_FUNCTION do_test
47#define EXPECTED_SIGNAL SIGABRT
48#include <support/test-driver.c>
49

source code of glibc/malloc/tst-tcfree2.c