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.