| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 30/46] xfs: fix partially uninitialized structure in xfs_reflink_remap_extent | Date | Fri, 1 May 2020 15:22:55 +0200 |
| |
From: Darrick J. Wong <darrick.wong@oracle.com>
[ Upstream commit c142932c29e533ee892f87b44d8abc5719edceec ]
In the reflink extent remap function, it turns out that uirec (the block mapping corresponding only to the part of the passed-in mapping that got unmapped) was not fully initialized. Specifically, br_state was not being copied from the passed-in struct to the uirec. This could lead to unpredictable results such as the reflinked mapping being marked unwritten in the destination file.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- fs/xfs/xfs_reflink.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index f3c393f309e19..6622652a85a80 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1058,6 +1058,7 @@ xfs_reflink_remap_extent( uirec.br_startblock = irec->br_startblock + rlen; uirec.br_startoff = irec->br_startoff + rlen; uirec.br_blockcount = unmap_len - rlen; + uirec.br_state = irec->br_state; unmap_len = rlen; /* If this isn't a real mapping, we're done. */ -- 2.20.1
|