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2004-09-08  Ulrich Drepper  <drepper@redhat.com>

	* malloc/malloc.c (_int_free): Add inexpensive double free test.
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Ulrich Drepper 2004-09-09 01:58:35 +00:00
parent 4924c0072b
commit 9d0cdc0eea
2 changed files with 11 additions and 0 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2004-09-08 Ulrich Drepper <drepper@redhat.com>
* malloc/malloc.c (_int_free): Add inexpensive double free test.
2004-09-08 Roland McGrath <roland@redhat.com>
* malloc/mcheck.c: Don't use __P.

7
malloc/malloc.c
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@ -4201,6 +4201,13 @@ _int_free(mstate av, Void_t* mem)
set_fastchunks(av);
fb = &(av->fastbins[fastbin_index(size)]);
/* Another simple check: make sure the top of the bin is not the
record we are going to add (i.e., double free). */
if (__builtin_expect (*fb == p, 0))
{
malloc_printf_nc (check_action, "double free(%p)!\n", mem);
return;
}
p->fd = *fb;
*fb = p;
}