malloc/tst-malloc-check.c

   1 /* Copyright (C) 2005-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <libc-diag.h>
  22
  23 static int errors = 0;
  24
  25 static void
  26 merror (const char *msg)
  27 {
  28   ++errors;
  29   printf ("Error: %s\n", msg);
  30 }
  31
  32 static int
  33 do_test (void)
  34 {
  35   void *p, *q;
  36
  37   errno = 0;
  38
  39   DIAG_PUSH_NEEDS_COMMENT;
  40 #if __GNUC_PREREQ (7, 0)
  41   /* GCC 7 warns about too-large allocations; here we want to test
  42      that they fail.  */
  43   DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
  44 #endif
  45   p = malloc (-1);
  46   DIAG_POP_NEEDS_COMMENT;
  47
  48   if (p != NULL)
  49     merror ("malloc (-1) succeeded.");
  50   else if (errno != ENOMEM)
  51     merror ("errno is not set correctly.");
  52
  53   p = malloc (10);
  54   if (p == NULL)
  55     merror ("malloc (10) failed.");
  56
  57   p = realloc (p, 0);
  58   if (p != NULL)
  59     merror ("realloc (p, 0) failed.");
  60
  61   p = malloc (0);
  62   if (p == NULL)
  63     merror ("malloc (0) failed.");
  64
  65   p = realloc (p, 0);
  66   if (p != NULL)
  67     merror ("realloc (p, 0) failed.");
  68
  69   q = malloc (256);
  70   if (q == NULL)
  71     merror ("malloc (256) failed.");
  72
  73   p = malloc (512);
  74   if (p == NULL)
  75     merror ("malloc (512) failed.");
  76
  77   DIAG_PUSH_NEEDS_COMMENT;
  78 #if __GNUC_PREREQ (7, 0)
  79   /* GCC 7 warns about too-large allocations; here we want to test
  80      that they fail.  */
  81   DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
  82 #endif
  83   if (realloc (p, -256) != NULL)
  84     merror ("realloc (p, -256) succeeded.");
  85   else if (errno != ENOMEM)
  86     merror ("errno is not set correctly.");
  87   DIAG_POP_NEEDS_COMMENT;
  88
  89 #if __GNUC_PREREQ (12, 0)
  90   /* Ignore a valid warning about using a pointer made indeterminate
  91      by a prior call to realloc().  */
  92   DIAG_IGNORE_NEEDS_COMMENT (12, "-Wuse-after-free");
  93 #endif
  94   free (p);
  95 #if __GNUC_PREREQ (12, 0)
  96   DIAG_POP_NEEDS_COMMENT;
  97 #endif
  98
  99   p = malloc (512);
 100   if (p == NULL)
 101     merror ("malloc (512) failed.");
 102
 103   DIAG_PUSH_NEEDS_COMMENT;
 104 #if __GNUC_PREREQ (7, 0)
 105   /* GCC 7 warns about too-large allocations; here we want to test
 106      that they fail.  */
 107   DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
 108 #endif
 109   if (realloc (p, -1) != NULL)
 110     merror ("realloc (p, -1) succeeded.");
 111   else if (errno != ENOMEM)
 112     merror ("errno is not set correctly.");
 113   DIAG_POP_NEEDS_COMMENT;
 114
 115 #if __GNUC_PREREQ (12, 0)
 116   /* Ignore a valid warning about using a pointer made indeterminate
 117      by a prior call to realloc().  */
 118   DIAG_IGNORE_NEEDS_COMMENT (12, "-Wuse-after-free");
 119 #endif
 120   free (p);
 121 #if __GNUC_PREREQ (12, 0)
 122   DIAG_POP_NEEDS_COMMENT;
 123 #endif
 124   free (q);
 125
 126   return errors != 0;
 127 }
 128
 129 #define TEST_FUNCTION do_test ()
 130 #include "../test-skeleton.c"