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Add some more tests to malloc to detect corruptions.

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This commit is contained in:
Ulrich Drepper
2009-06-18 22:37:31 -07:00
parent d0a2af7106
commit f6887a0d9a
2 changed files with 31 additions and 3 deletions
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29
malloc/malloc.c
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@@ -4241,6 +4241,8 @@ _int_malloc(mstate av, size_t bytes)
mchunkptr fwd; /* misc temp for linking */
mchunkptr bck; /* misc temp for linking */
const char *errstr = NULL;
/*
Convert request size to internal form by adding SIZE_SZ bytes
overhead plus possibly more to obtain necessary alignment and/or
@@ -4276,8 +4278,11 @@ _int_malloc(mstate av, size_t bytes)
#endif
if (victim != 0) {
if (__builtin_expect (fastbin_index (chunksize (victim)) != idx, 0))
malloc_printerr (check_action, "malloc(): memory corruption (fast)",
chunk2mem (victim));
{
errstr = "malloc(): memory corruption (fast)";
errout:
malloc_printerr (check_action, errstr, chunk2mem (victim));
}
#ifndef ATOMIC_FASTBINS
*fb = victim->fd;
#endif
@@ -4306,6 +4311,11 @@ _int_malloc(mstate av, size_t bytes)
malloc_consolidate(av);
else {
bck = victim->bk;
if (__builtin_expect (bck->fd != victim, 0))
{
errstr = "malloc(): smallbin double linked list corrupted";
goto errout;
}
set_inuse_bit_at_offset(victim, nb);
bin->bk = bck;
bck->fd = bin;
@@ -4515,6 +4525,11 @@ _int_malloc(mstate av, size_t bytes)
have to perform a complete insert here. */
bck = unsorted_chunks(av);
fwd = bck->fd;
if (__builtin_expect (fwd->bk != bck, 0))
{
errstr = "malloc(): corrupted unsorted chunks";
goto errout;
}
remainder->bk = bck;
remainder->fd = fwd;
bck->fd = remainder;
@@ -4610,6 +4625,11 @@ _int_malloc(mstate av, size_t bytes)
have to perform a complete insert here. */
bck = unsorted_chunks(av);
fwd = bck->fd;
if (__builtin_expect (fwd->bk != bck, 0))
{
errstr = "malloc(): corrupted unsorted chunks 2";
goto errout;
}
remainder->bk = bck;
remainder->fd = fwd;
bck->fd = remainder;
@@ -4901,6 +4921,11 @@ _int_free(mstate av, mchunkptr p)
bck = unsorted_chunks(av);
fwd = bck->fd;
if (__builtin_expect (fwd->bk != bck, 0))
{
errstr = "free(): corrupted unsorted chunks";
goto errout;
}
p->fd = fwd;
p->bk = bck;
if (!in_smallbin_range(size))