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>

diff --git a/mm/kasan/init.c b/mm/kasan/init.c
index 7dd63b7..b8c6ec1 100644 (file)
--- a/mm/kasan/init.c
+++ b/mm/kasan/init.c
@@ -492,7 +492,6 @@ 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;
 }