[PATCH AUTOSEL 4.9 29/41] xfs: make sure the rt allocator doesn't run off the end

[Sasha Levin <sashal@kernel.org>]

From: "Darrick J. Wong" <darrick.wong@oracle.com>

[ Upstream commit 2a6ca4baed620303d414934aa1b7b0a8e7bab05f ]

There's an overflow bug in the realtime allocator.  If the rt volume is
large enough to handle a single allocation request that is larger than
the maximum bmap extent length and the rt bitmap ends exactly on a
bitmap block boundary, it's possible that the near allocator will try to
check the freeness of a range that extends past the end of the bitmap.
This fails with a corruption error and shuts down the fs.

Therefore, constrain maxlen so that the range scan cannot run off the
end of the rt bitmap.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/xfs/xfs_rtalloc.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 0d93d3c10fcc4..d812f84252d5b 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -257,6 +257,9 @@ xfs_rtallocate_extent_block(
 		end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
 	     i <= end;
 	     i++) {
+		/* Make sure we don't scan off the end of the rt volume. */
+		maxlen = min(mp->m_sb.sb_rextents, i + maxlen) - i;
+
 		/*
 		 * See if there's a free extent of maxlen starting at i.
 		 * If it's not so then next will contain the first non-free.
@@ -448,6 +451,14 @@ xfs_rtallocate_extent_near(
 	 */
 	if (bno >= mp->m_sb.sb_rextents)
 		bno = mp->m_sb.sb_rextents - 1;
+
+	/* Make sure we don't run off the end of the rt volume. */
+	maxlen = min(mp->m_sb.sb_rextents, bno + maxlen) - bno;
+	if (maxlen < minlen) {
+		*rtblock = NULLRTBLOCK;
+		return 0;
+	}
+
 	/*
 	 * Try the exact allocation first.
 	 */
-- 
2.25.1