linux-kernel - Re: [PATCH v4 01/12] nvdimm/pmem: Fix leak on dax_add

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Date: Thu, 8 Feb 2024 13:21:12 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Dan Williams <dan.j.williams@...el.com>, Arnd Bergmann <arnd@...db.de>,
 Dave Chinner <david@...morbit.com>, linux-kernel@...r.kernel.org, Linus
 Torvalds <torvalds@...ux-foundation.org>, Vishal Verma
 <vishal.l.verma@...el.com>, Dave Jiang <dave.jiang@...el.com>, Matthew
 Wilcox <willy@...radead.org>, Russell King <linux@...linux.org.uk>,
 linux-arch@...r.kernel.org, linux-cxl@...r.kernel.org,
 linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
 linux-xfs@...r.kernel.org, dm-devel@...ts.linux.dev,
 nvdimm@...ts.linux.dev, linux-s390@...r.kernel.org, Alasdair Kergon
 <agk@...hat.com>, Mike Snitzer <snitzer@...nel.org>, Mikulas Patocka
 <mpatocka@...hat.com>
Subject: Re: [PATCH v4 01/12] nvdimm/pmem: Fix leak on dax_add_host()
 failure

On Thu,  8 Feb 2024 13:49:02 -0500 Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:

> Fix a leak on dax_add_host() error, where "goto out_cleanup_dax" is done
> before setting pmem->dax_dev, which therefore issues the two following
> calls on NULL pointers:
> 
> out_cleanup_dax:
>         kill_dax(pmem->dax_dev);
>         put_dax(pmem->dax_dev);

Seems inappropriate that this fix is within this patch series?

otoh I assume dax_add_host() has never failed so it doesn't matter much.


The series seems useful but is at v4 without much sign of review
activity.  I think I'll take silence as assent and shall slam it all
into -next and see who shouts at me.