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: e89c041338
("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>
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@ -255,6 +255,9 @@ xfs_getfsmap_helper(
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/* Are we just counting mappings? */
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if (info->head->fmh_count == 0) {
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if (info->head->fmh_entries == UINT_MAX)
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return -ECANCELED;
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if (rec_daddr > info->next_daddr)
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info->head->fmh_entries++;
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