From: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
<kasan-dev@googlegroups.com>, <linux-mm@kvack.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>, <wsd_upstream@mediatek.com>,
<stable@vger.kernel.org>
Subject: Re: [PATCH 1/1] kasan: fix memory leak of kasan quarantine
Date: Thu, 17 Dec 2020 18:28:48 +0800 [thread overview]
Message-ID: <1608200928.31376.37.camel@mtksdccf07> (raw)
In-Reply-To: <1608031683-24967-2-git-send-email-Kuan-Ying.Lee@mediatek.com>
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.
prev parent reply other threads:[~2020-12-17 10:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-15 11:28 [PATCH 0/1] kasan: fix memory leak of kasan quarantine Kuan-Ying Lee
2020-12-15 11:28 ` [PATCH 1/1] " Kuan-Ying Lee
2020-12-17 10:28 ` Kuan-Ying Lee [this message]
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