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xfs: xfs_rtbuf_get should check the bmapi_read results

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The xfs_rtbuf_get function should check the block mapping it gets back
from bmapi_read.  If there are no mappings or the mapping isn't a real
extent, we should return -EFSCORRUPTED rather than trying to read a
garbage value.  We also require realtime bitmap blocks to be real,
written allocations.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-05-31 09:07:20 -07:00
parent 2483113f3d
commit a03f1641c7
1 changed files with 3 additions and 0 deletions
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3
fs/xfs/libxfs/xfs_rtbitmap.c
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@ -90,6 +90,9 @@ xfs_rtbuf_get(
if (error)
return error;
if (nmap == 0 || !xfs_bmap_is_real_extent(&map))
return -EFSCORRUPTED;
ASSERT(map.br_startblock != NULLFSBLOCK);
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, map.br_startblock),