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It's wrong to add len to sector_nr in raid10 reshape twice

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commit b761dcf121 upstream.

In reshape_request it already adds len to sector_nr already. It's wrong to add len to
sector_nr again after adding pages to bio. If there is bad block it can't copy one chunk
at a time, it needs to goto read_more. Now the sector_nr is wrong. It can cause data
corruption.

Cc: stable@vger.kernel.org # v3.16+
Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiao Ni 2019-03-08 23:52:05 +08:00 committed by Greg Kroah-Hartman
parent d6b577c620
commit 27143c71d6
1 changed files with 0 additions and 1 deletions
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drivers/md/raid10.c
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@ -4630,7 +4630,6 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr,
atomic_inc(&r10_bio->remaining);
read_bio->bi_next = NULL;
generic_make_request(read_bio);
sector_nr += nr_sectors;
sectors_done += nr_sectors;
if (sector_nr <= last)
goto read_more;