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malloc: Exit early on test failure in tst-realloc

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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>
This commit is contained in:
Florian Weimer 2022-03-10 08:50:51 +01:00
parent 590f5992b6
commit d653fd2d9e
1 changed files with 15 additions and 31 deletions
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46
malloc/tst-realloc.c
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@ -20,15 +20,7 @@
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <libc-diag.h> #include <libc-diag.h>
#include <support/check.h>
static int errors = 0;
static void
merror (const char *msg)
{
++errors;
printf ("Error: %s\n", msg);
}
static int static int
do_test (void) do_test (void)
@ -51,11 +43,11 @@ do_test (void)
save = errno; save = errno;
if (p != NULL) if (p != NULL)
merror ("realloc (NULL, -1) succeeded."); FAIL_EXIT1 ("realloc (NULL, -1) succeeded.");
/* errno should be set to ENOMEM on failure (POSIX). */ /* errno should be set to ENOMEM on failure (POSIX). */
if (p == NULL && save != ENOMEM) if (p == NULL && save != ENOMEM)
merror ("errno is not set correctly"); FAIL_EXIT1 ("errno is not set correctly");
errno = 0; errno = 0;
@ -64,18 +56,18 @@ do_test (void)
save = errno; save = errno;
if (p == NULL) if (p == NULL)
merror ("realloc (NULL, 10) failed."); FAIL_EXIT1 ("realloc (NULL, 10) failed.");
free (p); free (p);
p = calloc (20, 1); p = calloc (20, 1);
if (p == NULL) if (p == NULL)
merror ("calloc (20, 1) failed."); FAIL_EXIT1 ("calloc (20, 1) failed.");
/* Check increasing size preserves contents (C89). */ /* Check increasing size preserves contents (C89). */
p = realloc (p, 200); p = realloc (p, 200);
if (p == NULL) if (p == NULL)
merror ("realloc (p, 200) failed."); FAIL_EXIT1 ("realloc (p, 200) failed.");
c = p; c = p;
ok = 1; ok = 1;
@ -87,20 +79,20 @@ do_test (void)
} }
if (ok == 0) if (ok == 0)
merror ("first 20 bytes were not cleared"); FAIL_EXIT1 ("first 20 bytes were not cleared");
free (p); free (p);
p = realloc (NULL, 100); p = realloc (NULL, 100);
if (p == NULL) if (p == NULL)
merror ("realloc (NULL, 100) failed."); FAIL_EXIT1 ("realloc (NULL, 100) failed.");
memset (p, 0xff, 100); memset (p, 0xff, 100);
/* Check decreasing size preserves contents (C89). */ /* Check decreasing size preserves contents (C89). */
p = realloc (p, 16); p = realloc (p, 16);
if (p == NULL) if (p == NULL)
merror ("realloc (p, 16) failed."); FAIL_EXIT1 ("realloc (p, 16) failed.");
c = p; c = p;
ok = 1; ok = 1;
@ -112,7 +104,7 @@ do_test (void)
} }
if (ok == 0) if (ok == 0)
merror ("first 16 bytes were not correct"); FAIL_EXIT1 ("first 16 bytes were not correct");
/* Check failed realloc leaves original untouched (C89). */ /* Check failed realloc leaves original untouched (C89). */
DIAG_PUSH_NEEDS_COMMENT; DIAG_PUSH_NEEDS_COMMENT;
@ -124,7 +116,7 @@ do_test (void)
c = realloc (p, -1); c = realloc (p, -1);
DIAG_POP_NEEDS_COMMENT; DIAG_POP_NEEDS_COMMENT;
if (c != NULL) if (c != NULL)
merror ("realloc (p, -1) succeeded."); FAIL_EXIT1 ("realloc (p, -1) succeeded.");
c = p; c = p;
ok = 1; ok = 1;
@ -136,29 +128,21 @@ do_test (void)
} }
if (ok == 0) if (ok == 0)
merror ("first 16 bytes were not correct after failed realloc"); FAIL_EXIT1 ("first 16 bytes were not correct after failed realloc");
#if __GNUC_PREREQ (12, 0)
/* Ignore a valid warning about using a pointer made indeterminate
by a prior call to realloc(). */
DIAG_IGNORE_NEEDS_COMMENT (12, "-Wuse-after-free");
#endif
/* realloc (p, 0) frees p (C89) and returns NULL (glibc). */ /* realloc (p, 0) frees p (C89) and returns NULL (glibc). */
p = realloc (p, 0); p = realloc (p, 0);
#if __GNUC_PREREQ (12, 0)
DIAG_POP_NEEDS_COMMENT;
#endif
if (p != NULL) if (p != NULL)
merror ("realloc (p, 0) returned non-NULL."); FAIL_EXIT1 ("realloc (p, 0) returned non-NULL.");
/* realloc (NULL, 0) acts like malloc (0) (glibc). */ /* realloc (NULL, 0) acts like malloc (0) (glibc). */
p = realloc (NULL, 0); p = realloc (NULL, 0);
if (p == NULL) if (p == NULL)
merror ("realloc (NULL, 0) returned NULL."); FAIL_EXIT1 ("realloc (NULL, 0) returned NULL.");
free (p); free (p);
return errors != 0; return 0;
} }
#define TEST_FUNCTION do_test () #define TEST_FUNCTION do_test ()