[PATCH] malloc: harden removal from unsorted list

[DJ Delorie]

LGTM.  ChangeLog?

Francois Goichon <fgoichon@google.com> writes:
> diff --git a/malloc/malloc.c b/malloc/malloc.c
> index 58f9acd4d1..fd1a263e9e 100644
> --- a/malloc/malloc.c
> +++ b/malloc/malloc.c
> @@ -3775,6 +3775,8 @@ _int_malloc (mstate av, size_t bytes)
>               }
>
>             /* remove from unsorted list */
> +          if (__glibc_unlikely (bck->fd != victim))
> +            malloc_printerr ("malloc(): corrupted unsorted chunks 3");
>             unsorted_chunks (av)->bk = bck;
>             bck->fd = unsorted_chunks (av);