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xfs: fix possible overflow in xfs_ioc_trim()
In xfs_ioc_trim it is possible that computing the last allocation group to discard might overflow for big start & len values, because the result might be bigger then xfs_agnumber_t which is 32 bit long. Fix this by not allowing the start and end block of the range to be beyond the end of the file system. Note that if the start is beyond the end of the file system we have to return -EINVAL, but in the "end" case we have to truncate it to the fs size. Also introduce "end" variable, rather than using start+len which which might be more confusing to get right as this bug shows. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
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1 changed files with 10 additions and 10 deletions
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@ -38,7 +38,7 @@ xfs_trim_extents(
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struct xfs_mount *mp,
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xfs_agnumber_t agno,
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xfs_fsblock_t start,
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xfs_fsblock_t len,
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xfs_fsblock_t end,
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xfs_fsblock_t minlen,
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__uint64_t *blocks_trimmed)
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{
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@ -100,7 +100,7 @@ xfs_trim_extents(
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* down partially overlapping ranges for now.
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*/
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if (XFS_AGB_TO_FSB(mp, agno, fbno) + flen < start ||
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XFS_AGB_TO_FSB(mp, agno, fbno) >= start + len) {
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XFS_AGB_TO_FSB(mp, agno, fbno) > end) {
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trace_xfs_discard_exclude(mp, agno, fbno, flen);
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goto next_extent;
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}
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@ -145,7 +145,7 @@ xfs_ioc_trim(
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struct request_queue *q = mp->m_ddev_targp->bt_bdev->bd_disk->queue;
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unsigned int granularity = q->limits.discard_granularity;
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struct fstrim_range range;
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xfs_fsblock_t start, len, minlen;
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xfs_fsblock_t start, end, minlen;
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xfs_agnumber_t start_agno, end_agno, agno;
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__uint64_t blocks_trimmed = 0;
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int error, last_error = 0;
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@ -165,19 +165,19 @@ xfs_ioc_trim(
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* matter as trimming blocks is an advisory interface.
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*/
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start = XFS_B_TO_FSBT(mp, range.start);
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len = XFS_B_TO_FSBT(mp, range.len);
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end = start + XFS_B_TO_FSBT(mp, range.len) - 1;
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minlen = XFS_B_TO_FSB(mp, max_t(u64, granularity, range.minlen));
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start_agno = XFS_FSB_TO_AGNO(mp, start);
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if (start_agno >= mp->m_sb.sb_agcount)
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if (start >= mp->m_sb.sb_dblocks)
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return -XFS_ERROR(EINVAL);
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if (end > mp->m_sb.sb_dblocks - 1)
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end = mp->m_sb.sb_dblocks - 1;
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end_agno = XFS_FSB_TO_AGNO(mp, start + len);
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if (end_agno >= mp->m_sb.sb_agcount)
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end_agno = mp->m_sb.sb_agcount - 1;
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start_agno = XFS_FSB_TO_AGNO(mp, start);
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end_agno = XFS_FSB_TO_AGNO(mp, end);
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for (agno = start_agno; agno <= end_agno; agno++) {
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error = -xfs_trim_extents(mp, agno, start, len, minlen,
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error = -xfs_trim_extents(mp, agno, start, end, minlen,
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&blocks_trimmed);
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if (error)
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last_error = error;
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