Re: [PATCH 1/1] kasan: fix memory leak of kasan quarantine

Kuan-Ying Lee
2020-12-17T10:34:37Z

On Tue, 2020-12-15 at 19:28 +0800, Kuan-Ying Lee wrote:
> When cpu is going offline, set q->offline as true
> and interrupt happened. The interrupt may call the
> quarantine_put. But quarantine_put do not free the
> the object. The object will cause memory leak.
>
> Add qlink_free() to free the object.
>
> Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Alexander Potapenko <glider@google.com>
> Cc: Dmitry Vyukov <dvyukov@google.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Matthias Brugger <matthias.bgg@gmail.com>
> Cc: <stable@vger.kernel.org> [5.10-]
> ---
> mm/kasan/quarantine.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
> index 0e3f8494628f..cac7c617df72 100644
> --- a/mm/kasan/quarantine.c
> +++ b/mm/kasan/quarantine.c
> @@ -191,6 +191,7 @@ void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache)
>
> q = this_cpu_ptr(&cpu_quarantine);
> if (q->offline) {
> + qlink_free(&info->quarantine_link, cache);
> local_irq_restore(flags);
> return;
> }

Sorry.

Please ignore this patch.

Thanks.