tree 16e0aa29d2f5e41cc7aee777a16a75d5a9488615
parent 3882d3641aff02002cc5c9570b0dd99f9685063c
author Darrick J. Wong <darrick.wong@oracle.com> 1601574967 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1603961717 +0100

xfs: limit entries returned when counting fsmap records

[ Upstream commit acd1ac3aa22fd58803a12d26b1ab7f70232f8d8d ]

If userspace asked fsmap to count the number of entries, we cannot
return more than UINT_MAX entries because fmh_entries is u32.
Therefore, stop counting if we hit this limit or else we will waste time
to return truncated results.

Fixes: e89c041338ed ("xfs: implement the GETFSMAP ioctl")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>