linux-kernel - Re: [PATCH 1/2] mm/slub: fix slab double-free in case of duplicate sysfs filename

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Message-ID: <alpine.DEB.2.10.1507151727320.9230@chino.kir.corp.google.com>
Date:	Wed, 15 Jul 2015 17:27:43 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
cc:	linux-mm@...ck.org, Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mm/slub: fix slab double-free in case of duplicate
 sysfs filename

On Tue, 14 Jul 2015, Konstantin Khlebnikov wrote:

> sysfs_slab_add() shouldn't call kobject_put at error path: this puts
> last reference of kmem-cache kobject and frees it. Kmem cache will be
> freed second time at error path in kmem_cache_create().
> 
> For example this happens when slub debug was enabled in runtime and
> somebody creates new kmem cache:
> 
> # echo 1 | tee /sys/kernel/slab/*/sanity_checks
> # modprobe configfs
> 
> "configfs_dir_cache" cannot be merged because existing slab have debug and
> cannot create new slab because unique name ":t-0000096" already taken.
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>

Acked-by: David Rientjes <rientjes@...gle.com>
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