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xfs: strengthen rtalloc query range checks 

Strengthen the rtalloc range query checks to make sure that the keys do
not run off the end of the realtime device inappropriately.  Note that
the query range functions require units of rt extents, not blocks,
despite the type name.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-05-31 09:07:21 -07:00
parent a03f1641c7
commit 8ad560d256
1 changed files with 5 additions and 2 deletions
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7
fs/xfs/libxfs/xfs_rtbitmap.c
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@ -1038,8 +1038,11 @@ xfs_rtalloc_query_range(
if (low_rec->ar_startblock > high_rec->ar_startblock)
return -EINVAL;
else if (low_rec->ar_startblock == high_rec->ar_startblock)
if (low_rec->ar_startblock >= mp->m_sb.sb_rextents ||
low_rec->ar_startblock == high_rec->ar_startblock)
return 0;
if (high_rec->ar_startblock >= mp->m_sb.sb_rextents)
high_rec->ar_startblock = mp->m_sb.sb_rextents - 1;
/* Iterate the bitmap, looking for discrepancies. */
rtstart = low_rec->ar_startblock;
@ -1083,7 +1086,7 @@ xfs_rtalloc_query_all(
struct xfs_rtalloc_rec keys[2];
keys[0].ar_startblock = 0;
keys[1].ar_startblock = tp->t_mountp->m_sb.sb_rblocks;
keys[1].ar_startblock = tp->t_mountp->m_sb.sb_rextents - 1;
keys[0].ar_blockcount = keys[1].ar_blockcount = 0;
return xfs_rtalloc_query_range(tp, &keys[0], &keys[1], fn, priv);