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| author |   Darrick J. Wong <darrick.wong@oracle.com> | 2018-06-21 23:26:58 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-06-24 11:56:36 -0700 |
| commit | a3a374bf1889b1b401b25e6aada3ca4151a99d15 (patch) | |
| tree | fcc3f1b4f93b9a70f60a89f046ca431fccec1ffe | |
| parent | xfs: fix uninitialized field in rtbitmap fsmap backend (diff) | |
| download | linux-dev-a3a374bf1889b1b401b25e6aada3ca4151a99d15.tar.xz linux-dev-a3a374bf1889b1b401b25e6aada3ca4151a99d15.zip | |
xfs: fix off-by-one error in xfs_rtalloc_query_range
In commit 8ad560d2565e6 ("xfs: strengthen rtalloc query range checks")
we strengthened the input parameter checks in the rtbitmap range query
function, but introduced an off-by-one error in the process. The call
to xfs_rtfind_forw deals with the high key being rextents, but we clamp
the high key to rextents - 1. This causes the returned results to stop
one block short of the end of the rtdev, which is incorrect.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
| -rw-r--r-- | fs/xfs/libxfs/xfs_rtbitmap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c index 65fc4ed2e9a1..b228c821bae6 100644 --- a/fs/xfs/libxfs/xfs_rtbitmap.c +++ b/fs/xfs/libxfs/xfs_rtbitmap.c @@ -1029,8 +1029,8 @@ xfs_rtalloc_query_range( if (low_rec->ar_startext >= mp->m_sb.sb_rextents || low_rec->ar_startext == high_rec->ar_startext) return 0; - if (high_rec->ar_startext >= mp->m_sb.sb_rextents) - high_rec->ar_startext = mp->m_sb.sb_rextents - 1; + if (high_rec->ar_startext > mp->m_sb.sb_rextents) + high_rec->ar_startext = mp->m_sb.sb_rextents; /* Iterate the bitmap, looking for discrepancies. */ rtstart = low_rec->ar_startext; |