linux-kernel - [PATCH 5.0 036/139] md: add a missing endianness conversion in check_sb

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Message-Id: <20190523181725.475254789@linuxfoundation.org>
Date:   Thu, 23 May 2019 21:05:24 +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, Guoqing Jiang <gqjiang@...e.com>,
        Christoph Hellwig <hch@....de>,
        Song Liu <songliubraving@...com>
Subject: [PATCH 5.0 036/139] md: add a missing endianness conversion in check_sb_changes

From: Christoph Hellwig <hch@....de>

commit ed4d0a4ea11e19863952ac6a7cea3bbb27ccd452 upstream.

The on-disk value is little endian and we need to convert it to
native endian before storing the value in the in-core structure.

Fixes: 7564beda19b36 ("md-cluster/raid10: support add disk under grow mode")
Cc: <stable@...r.kernel.org> # 4.20+
Acked-by: Guoqing Jiang <gqjiang@...e.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Song Liu <songliubraving@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -9229,7 +9229,7 @@ static void check_sb_changes(struct mdde
 		 * reshape is happening in the remote node, we need to
 		 * update reshape_position and call start_reshape.
 		 */
-		mddev->reshape_position = sb->reshape_position;
+		mddev->reshape_position = le64_to_cpu(sb->reshape_position);
 		if (mddev->pers->update_reshape_pos)
 			mddev->pers->update_reshape_pos(mddev);
 		if (mddev->pers->start_reshape)