xfs: make sure the rt allocator doesn't run off the end

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There's an overflow bug in the realtime allocator.  If the rt volume is
large enough to handle a single allocation request that is larger than
the maximum bmap extent length and the rt bitmap ends exactly on a
bitmap block boundary, it's possible that the near allocator will try to
check the freeness of a range that extends past the end of the bitmap.
This fails with a corruption error and shuts down the fs.

Therefore, constrain maxlen so that the range scan cannot run off the
end of the rt bitmap.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

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Darrick J. Wong 2020-09-09 14:21:06 -07:00

parent 0f4ec0f157

commit 2a6ca4baed

1 changed files with 11 additions and 0 deletions

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fs/xfs/xfs_rtalloc.c

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