kasan: free allocated shadow memory on MEM_CANCEL_ONLINE

commit ed1596f9ab958dd156a66c9ff1029d3761c1786a upstream.

We have to free memory again when we cancel onlining, otherwise a later
onlining attempt will fail.

Link: http://lkml.kernel.org/r/20180522100756.18478-2-david@redhat.com
Fixes: fa69b5989bb0 ("mm/kasan: add support for memory hotplug")
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 858b96057e0409dd983404fa656c4ce551551c15..bb44af48587f0cb2a1b501b73fb968a06c7a6174 100644 (file)
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -811,6 +811,7 @@ static int __meminit kasan_mem_notifier(struct notifier_block *nb,
                kmemleak_ignore(ret);
                return NOTIFY_OK;
        }
+       case MEM_CANCEL_ONLINE:
        case MEM_OFFLINE: {
                struct vm_struct *vm;