linux-kernel - [PATCH 4.18 060/145] dm writecache: fix a crash due to reading past end of dirty

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Date:   Fri,  7 Sep 2018 23:08:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, edo.rus@...il.com,
        Mikulas Patocka <mpatocka@...hat.com>,
        Mike Snitzer <snitzer@...hat.com>
Subject: [PATCH 4.18 060/145] dm writecache: fix a crash due to reading past end of dirty_bitmap

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mikulas Patocka <mpatocka@...hat.com>

commit 1e1132ea21da6d7be92a72195204379c819cb70b upstream.

wc->dirty_bitmap_size is in bytes so must multiply it by 8, not by
BITS_PER_LONG, to get number of bitmap_bits.

Fixes crash in find_next_bit() that was reported:
https://bugzilla.kernel.org/show_bug.cgi?id=200819

Reported-by: edo.rus@...il.com
Fixes: 48debafe4f2f ("dm: add writecache target")
Cc: stable@...r.kernel.org # 4.18
Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/dm-writecache.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -457,7 +457,7 @@ static void ssd_commit_flushed(struct dm
 		COMPLETION_INITIALIZER_ONSTACK(endio.c),
 		ATOMIC_INIT(1),
 	};
-	unsigned bitmap_bits = wc->dirty_bitmap_size * BITS_PER_LONG;
+	unsigned bitmap_bits = wc->dirty_bitmap_size * 8;
 	unsigned i = 0;
 
 	while (1) {