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

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Message-ID: <1608200928.31376.37.camel@mtksdccf07>
Date:   Thu, 17 Dec 2020 18:28:48 +0800
From:   Kuan-Ying Lee <Kuan-Ying.Lee@...iatek.com>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
CC:     Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        <kasan-dev@...glegroups.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH 1/1] kasan: fix memory leak of kasan quarantine

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@...iatek.com>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Matthias Brugger <matthias.bgg@...il.com>
> Cc: <stable@...r.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.