linux-kernel - [PATCH 4.19 50/58] kasan: fix incorrect arguments passing in kasan_add_zero

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Date:   Mon, 25 Jan 2021 19:39:51 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 4.19 50/58] kasan: fix incorrect arguments passing in kasan_add_zero_shadow

From: Lecopzer Chen <lecopzer@...il.com>

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@...iatek.com>
Reviewed-by: Andrey Konovalov <andreyknvl@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Alexander Potapenko <glider@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/kasan/kasan_init.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/mm/kasan/kasan_init.c
+++ b/mm/kasan/kasan_init.c
@@ -487,7 +487,6 @@ int kasan_add_zero_shadow(void *start, u
 
 	ret = kasan_populate_zero_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;
 }