diff options
| author | Christoph Hellwig <hch@lst.de> | 2024-02-22 12:40:57 -0800 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2024-02-22 12:40:57 -0800 |
| commit | d477f1749f00899c71605ea01aba0ce67e030471 (patch) | |
| tree | e4b392d739c1e23fd9a45d99309f8b26b6a51038 /fs/xfs | |
| parent | bd45019d9aa942d1c2457d96a7dbf2ad3051754b (diff) | |
| download | linux-d477f1749f00899c71605ea01aba0ce67e030471.tar.gz linux-d477f1749f00899c71605ea01aba0ce67e030471.tar.bz2 linux-d477f1749f00899c71605ea01aba0ce67e030471.zip | |
xfs: tighten up validation of root block in inode forks
Check that root blocks that sit in the inode fork and thus have a NULL
bp don't have siblings.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_btree.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c index 4a6bc66c14d0..f5d7c4236963 100644 --- a/fs/xfs/libxfs/xfs_btree.c +++ b/fs/xfs/libxfs/xfs_btree.c @@ -107,7 +107,7 @@ __xfs_btree_check_lblock( { struct xfs_mount *mp = cur->bc_mp; xfs_failaddr_t fa; - xfs_fsblock_t fsb = NULLFSBLOCK; + xfs_fsblock_t fsb; if (xfs_has_crc(mp)) { if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid)) @@ -127,9 +127,19 @@ __xfs_btree_check_lblock( cur->bc_ops->get_maxrecs(cur, level)) return __this_address; - if (bp) - fsb = XFS_DADDR_TO_FSB(mp, xfs_buf_daddr(bp)); + /* + * For inode-rooted btrees, the root block sits in the inode fork. In + * that case bp is NULL, and the block must not have any siblings. + */ + if (!bp) { + if (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK)) + return __this_address; + if (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK)) + return __this_address; + return NULL; + } + fsb = XFS_DADDR_TO_FSB(mp, xfs_buf_daddr(bp)); fa = xfs_btree_check_lblock_siblings(mp, fsb, block->bb_u.l.bb_leftsib); if (!fa) fa = xfs_btree_check_lblock_siblings(mp, fsb, |