From: David Hildenbrand <david@redhat.com>
Date: Fri, 25 May 2018 21:48:08 +0000 (-0700)
Subject: kasan: free allocated shadow memory on MEM_CANCEL_ONLINE
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b052960484fd40d6144a78773313c17154443177;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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 858b96057e04..bb44af48587f 100644
--- 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;