Re: [PATCH v2 1/4] mm/mempolicy: Fix memory leaks in mempolicy_sysfs_init()

[Gregory Price]

On Fri, Mar 14, 2025 at 10:55:00AM +0000, Jonathan Cameron wrote:
> > 
> > 1) allocate node_attrs and mempolicy_kobj up front and keep your
> >    reordering, this lets us clean up allocations on failure before
> >    kobject_init is called
> > 
> > 2) after this remove all the other code and just let
> >    mempolicy_kobj_release clean up node_attrs
> > 
> > 3) Add a (%d) to the error message to differentiate failures
> 
> Given how unlikely (and noisy) a memory allocation failure is,
> maybe just drop the printing at all in those paths - allowing
> early returns.
> 
> The lifetime rules around node_attrs in here are making readability
> poor. It is implicitly owned by the mempolicy_kobj, but no direct association.
> Maybe just encapsulating the kobject in a structure that contains
> this as a [] array at the end.  Then we end up with single allocation of
> stuff that is effectively one thing.
>

Even better recommendation, lets do as Jonathan suggests. <3

~Gregory