From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
The code that validates recovered bmap intent items is kind of a mess --
it doesn't use the standard xfs type validators, and it doesn't check
for things that it should. Fix the validator function to use the
standard validation helpers and look for more types of obvious errors.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/xfs_bmap_item.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)
diff --git a/fs/xfs/xfs_bmap_item.c b/fs/xfs/xfs_bmap_item.c
index c90d018fbc2e..19f89a6b65a1 100644
--- a/fs/xfs/xfs_bmap_item.c
+++ b/fs/xfs/xfs_bmap_item.c
@@ -424,18 +424,13 @@ xfs_bui_validate(
struct xfs_bui_log_item *buip)
{
struct xfs_map_extent *bmap;
- xfs_fsblock_t startblock_fsb;
- xfs_fsblock_t inode_fsb;
+ xfs_fsblock_t end;
/* Only one mapping operation per BUI... */
if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS)
return false;
bmap = &buip->bui_format.bui_extents[0];
- startblock_fsb = XFS_BB_TO_FSB(mp,
- XFS_FSB_TO_DADDR(mp, bmap->me_startblock));
- inode_fsb = XFS_BB_TO_FSB(mp, XFS_FSB_TO_DADDR(mp,
- XFS_INO_TO_FSB(mp, bmap->me_owner)));
if (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS)
return false;
@@ -448,13 +443,18 @@ xfs_bui_validate(
return false;
}
- if (startblock_fsb == 0 ||
- bmap->me_len == 0 ||
- inode_fsb == 0 ||
- startblock_fsb >= mp->m_sb.sb_dblocks ||
- bmap->me_len >= mp->m_sb.sb_agblocks ||
- inode_fsb >= mp->m_sb.sb_dblocks ||
- (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS))
+ if (!xfs_verify_ino(mp, bmap->me_owner))
+ return false;
+
+ if (bmap->me_startoff + bmap->me_len <= bmap->me_startoff)
+ return false;
+
+ if (bmap->me_startblock + bmap->me_len <= bmap->me_startblock)
+ return false;
+
+ end = bmap->me_startblock + bmap->me_len - 1;
+ if (!xfs_verify_fsbno(mp, bmap->me_startblock) ||
+ !xfs_verify_fsbno(mp, end))
return false;
return true;
