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xfs: don't perform lookups on zero-height btrees
If the caller passes in a cursor to a zero-height btree (which is impossible), we never set block to anything but NULL, which causes the later dereference of it to crash. Instead, just return -EFSCORRUPTED. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
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@ -1814,6 +1814,10 @@ xfs_btree_lookup(
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XFS_BTREE_STATS_INC(cur, lookup);
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/* No such thing as a zero-level tree. */
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if (cur->bc_nlevels == 0)
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return -EFSCORRUPTED;
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block = NULL;
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keyno = 0;
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