Re: [PATCH 04/11] cgroup: use kzalloc() and list_del_init()

From: Kent Overstreet
Date: Wed Jun 12 2013 - 22:43:19 EST

On Wed, Jun 12, 2013 at 07:41:15PM -0700, Tejun Heo wrote:
> Hello,
> On Wed, Jun 12, 2013 at 7:38 PM, Kent Overstreet <koverstreet@xxxxxxxxxx> wrote:
> > IMO, list_del() is preferred when the object shouldn't be reused (i.e.
> > it gets taken off a list and then it's freed). list_del_init() could
> > hide bugs.
> Nah... use-after-frees are detected much more reliably by poisoning
> anyway. Using list_del() instead of list_del_init() to hunt down
> use-after-free isn't a good idea because you're likely to corrupt the
> memory of unrelated area. I really don't see much point in using
> list_del().

list_del() does do poisoning - and list debugging is cheaper to enable
than full slab debugging.
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