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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2020-10-01 10:56:07 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2020-10-07 08:40:29 -0700 |
| commit | acd1ac3aa22fd58803a12d26b1ab7f70232f8d8d (patch) | |
| tree | 92a1d1bad509ebe50a716e99a1103c85b6686944 | |
| parent | 74f4d6a1e065c92428c5b588099e307a582d79d9 (diff) | |
| download | linux-acd1ac3aa22fd58803a12d26b1ab7f70232f8d8d.tar.gz linux-acd1ac3aa22fd58803a12d26b1ab7f70232f8d8d.tar.bz2 linux-acd1ac3aa22fd58803a12d26b1ab7f70232f8d8d.zip | |
xfs: limit entries returned when counting fsmap records
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>
| -rw-r--r-- | fs/xfs/xfs_fsmap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 4eebcec4aae6..aa36e7daf82c 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -256,6 +256,9 @@ xfs_getfsmap_helper( /* Are we just counting mappings? */ if (info->head->fmh_count == 0) { + if (info->head->fmh_entries == UINT_MAX) + return -ECANCELED; + if (rec_daddr > info->next_daddr) info->head->fmh_entries++; |