From da3711f42c68326faf20ce3ce07c4c4709fa530a Mon Sep 17 00:00:00 2001
From: Lecopzer Chen <lecopzer@gmail.com>
Date: Sat, 23 Jan 2021 21:01:29 -0800
Subject: [PATCH] kasan: fix incorrect arguments passing in
 kasan_add_zero_shadow

commit 5dabd1712cd056814f9ab15f1d68157ceb04e741 upstream.

kasan_remove_zero_shadow() shall use original virtual address, start and
size, instead of shadow address.

Link: https://lkml.kernel.org/r/20210103063847.5963-1-lecopzer@gmail.com
Fixes: 0207df4fa1a86 ("kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN")
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
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>
---
 mm/kasan/init.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/kasan/init.c b/mm/kasan/init.c
index 75e41cb7313d..ee21e1c1150c 100644
--- a/mm/kasan/init.c
+++ b/mm/kasan/init.c
@@ -503,7 +503,6 @@ int kasan_add_zero_shadow(void *start, unsigned long size)
 
 	ret = kasan_populate_early_shadow(shadow_start, shadow_end);
 	if (ret)
-		kasan_remove_zero_shadow(shadow_start,
-					size >> KASAN_SHADOW_SCALE_SHIFT);
+		kasan_remove_zero_shadow(start, size);
 	return ret;
 }