[PATCH 6.6 002/140] xfs: assert a valid limit in xfs_rtfind_forw

6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Hellwig <[email protected]>

commit 6d2db12d56a389b3e8efa236976f8dc3a8ae00f0 upstream.

Protect against developers passing stupid limits when refactoring the
RT code once again.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
Signed-off-by: Catherine Hoang <[email protected]>
Acked-by: Darrick J. Wong <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 fs/xfs/libxfs/xfs_rtbitmap.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/xfs/libxfs/xfs_rtbitmap.c
+++ b/fs/xfs/libxfs/xfs_rtbitmap.c
@@ -288,6 +288,8 @@ xfs_rtfind_forw(
 	xfs_rtword_t	wdiff;		/* difference from wanted value */
 	int		word;		/* word number in the buffer */
 
+	ASSERT(start <= limit);
+
 	/*
 	 * Compute and read in starting bitmap block for starting block.
 	 */