From c447ad62dc906f4b5f788e8ff20c1768ab2eab2c Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Sun, 29 Nov 2020 16:33:37 -0800 Subject: [PATCH] xfs: improve the code that checks recovered rmap intent items The code that validates recovered rmap 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 Reviewed-by: Brian Foster --- fs/xfs/xfs_rmap_item.c | 30 ++++++++++++++++++------------ 1 file changed, 18 insertions(+), 12 deletions(-) diff --git a/fs/xfs/xfs_rmap_item.c b/fs/xfs/xfs_rmap_item.c index 19d2dc285ed6a..6f3250a220937 100644 --- a/fs/xfs/xfs_rmap_item.c +++ b/fs/xfs/xfs_rmap_item.c @@ -466,11 +466,9 @@ xfs_rui_validate_map( struct xfs_mount *mp, struct xfs_map_extent *rmap) { - xfs_fsblock_t startblock_fsb; - bool op_ok; + if (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS) + return false; - startblock_fsb = XFS_BB_TO_FSB(mp, - XFS_FSB_TO_DADDR(mp, rmap->me_startblock)); switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) { case XFS_RMAP_EXTENT_MAP: case XFS_RMAP_EXTENT_MAP_SHARED: @@ -480,17 +478,25 @@ xfs_rui_validate_map( case XFS_RMAP_EXTENT_CONVERT_SHARED: case XFS_RMAP_EXTENT_ALLOC: case XFS_RMAP_EXTENT_FREE: - op_ok = true; break; default: - op_ok = false; - break; + return false; } - if (!op_ok || startblock_fsb == 0 || - rmap->me_len == 0 || - startblock_fsb >= mp->m_sb.sb_dblocks || - rmap->me_len >= mp->m_sb.sb_agblocks || - (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS)) + + if (!XFS_RMAP_NON_INODE_OWNER(rmap->me_owner) && + !xfs_verify_ino(mp, rmap->me_owner)) + return false; + + if (rmap->me_startoff + rmap->me_len <= rmap->me_startoff) + return false; + + if (rmap->me_startblock + rmap->me_len <= rmap->me_startblock) + return false; + + if (!xfs_verify_fsbno(mp, rmap->me_startblock)) + return false; + + if (!xfs_verify_fsbno(mp, rmap->me_startblock + rmap->me_len - 1)) return false; return true; -- 2.30.2