[PATCH 0/1] kasan: fix memory leak of kasan quarantine

[PATCH 0/1] kasan: fix memory leak of kasan quarantine

[Kuan-Ying Lee]

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.

Kuan-Ying Lee (1):
  kasan: fix memory leak of kasan quarantine

 mm/kasan/quarantine.c | 1 +
 1 file changed, 1 insertion(+)

-- 
2.18.0
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[PATCH 1/1] kasan: fix memory leak of kasan quarantine

[Kuan-Ying Lee]

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;
 	}
-- 
2.18.0
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Re: [PATCH 1/1] kasan: fix memory leak of kasan quarantine

[Kuan-Ying Lee]

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.
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