4.20-stable review patch. If anyone has any objections, please let me know.
------------------
From: Xiao Ni xni@redhat.com
commit b761dcf1217760a42f7897c31dcb649f59b2333e 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
--- drivers/md/raid10.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -4692,7 +4692,6 @@ read_more: 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;