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Commit ed150e1a authored by Darrick J. Wong's avatar Darrick J. Wong Committed by Dave Chinner
Browse files

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: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent 32438cf9

fs/xfs/libxfs/xfs_btree.c

+4 −0
Original line number Diff line number Diff line
@@ -1814,6 +1814,10 @@ xfs_btree_lookup( 


	XFS_BTREE_STATS_INC(cur, lookup);



	/* No such thing as a zero-level tree. */

	if (cur->bc_nlevels == 0)

		return -EFSCORRUPTED;



	block = NULL;

	keyno = 0;