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malloc: Change top_check return type to void

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After commit ec2c1fcefb,
(malloc: Abort on heap corruption, without a backtrace), the function
always returns 0.

(cherry-picked from 5129873a8e)
This commit is contained in:
Florian Weimer 2017-08-31 12:02:59 +02:00 committed by Siddhesh Poyarekar
parent 675e8785dc
commit 533afac929
3 changed files with 20 additions and 15 deletions
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7
ChangeLog
View File

@ -1,3 +1,10 @@
2017-08-31 Florian Weimer <fweimer@redhat.com>
* malloc/malloc.c (top_check): Change return type to void. Remove
internal_function.
* malloc/hooks.c (top_check): Likewise.
(malloc_check, realloc_check, memalign_check): Adjust.
2017-08-30 Florian Weimer <fweimer@redhat.com>
* malloc/malloc.c (ARENA_CORRUPTION_BIT, arena_is_corrupt)

26
malloc/hooks.c
View File

@ -228,8 +228,7 @@ mem2chunk_check (void *mem, unsigned char **magic_p)
}
/* Check for corruption of the top chunk. */
static int
internal_function
static void
top_check (void)
{
mchunkptr t = top (&main_arena);
@ -240,7 +239,7 @@ top_check (void)
prev_inuse (t) &&
(!contiguous (&main_arena) ||
(char *) t + chunksize (t) == mp_.sbrk_base + main_arena.system_mem)))
return 0;
return;
malloc_printerr ("malloc: top chunk is corrupt");
}
@ -257,7 +256,8 @@ malloc_check (size_t sz, const void *caller)
}
__libc_lock_lock (main_arena.mutex);
victim = (top_check () >= 0) ? _int_malloc (&main_arena, sz + 1) : NULL;
top_check ();
victim = _int_malloc (&main_arena, sz + 1);
__libc_lock_unlock (main_arena.mutex);
return mem2mem_check (victim, sz);
}
@ -329,8 +329,8 @@ realloc_check (void *oldmem, size_t bytes, const void *caller)
else
{
/* Must alloc, copy, free. */
if (top_check () >= 0)
newmem = _int_malloc (&main_arena, bytes + 1);
top_check ();
newmem = _int_malloc (&main_arena, bytes + 1);
if (newmem)
{
memcpy (newmem, oldmem, oldsize - 2 * SIZE_SZ);
@ -341,12 +341,10 @@ realloc_check (void *oldmem, size_t bytes, const void *caller)
}
else
{
if (top_check () >= 0)
{
INTERNAL_SIZE_T nb;
checked_request2size (bytes + 1, nb);
newmem = _int_realloc (&main_arena, oldp, oldsize, nb);
}
top_check ();
INTERNAL_SIZE_T nb;
checked_request2size (bytes + 1, nb);
newmem = _int_realloc (&main_arena, oldp, oldsize, nb);
}
/* mem2chunk_check changed the magic byte in the old chunk.
@ -396,8 +394,8 @@ memalign_check (size_t alignment, size_t bytes, const void *caller)
}
__libc_lock_lock (main_arena.mutex);
mem = (top_check () >= 0) ? _int_memalign (&main_arena, alignment, bytes + 1) :
NULL;
top_check ();
mem = _int_memalign (&main_arena, alignment, bytes + 1);
__libc_lock_unlock (main_arena.mutex);
return mem2mem_check (mem, bytes);
}

2
malloc/malloc.c
View File

@ -1022,7 +1022,7 @@ static void* _mid_memalign(size_t, size_t, void *);
static void malloc_printerr(const char *str) __attribute__ ((noreturn));
static void* internal_function mem2mem_check(void *p, size_t sz);
static int internal_function top_check(void);
static void top_check (void);
static void internal_function munmap_chunk(mchunkptr p);
#if HAVE_MREMAP
static mchunkptr internal_function mremap_chunk(mchunkptr p, size_t new_size);