From 37804376121de1a25fb582bdd8970f139c4d9685 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Mon, 26 Aug 2013 14:13:30 +1000 Subject: XFS: Assertion failed: first <= last && last < BBTOB(bp->b_length), file: fs/xfs/xfs_trans_buf.c, line: 568 The calculation doesn't take into account the size of the dir v3 header, so overestimates the hash entries in a node. This causes directory buffer overruns when splitting and merging nodes. Signed-off-by: Dave Chinner Tested-by: Brian Foster Reviewed-by: Mark Tinguely Signed-off-by: Ben Myers --- fs/xfs/xfs_dir2.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) (limited to 'fs/xfs/xfs_dir2.c') diff --git a/fs/xfs/xfs_dir2.c b/fs/xfs/xfs_dir2.c index d3ff96c321f9..edf203ab50af 100644 --- a/fs/xfs/xfs_dir2.c +++ b/fs/xfs/xfs_dir2.c @@ -90,6 +90,9 @@ void xfs_dir_mount( xfs_mount_t *mp) { + int nodehdr_size; + + ASSERT(xfs_sb_version_hasdirv2(&mp->m_sb)); ASSERT((1 << (mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog)) <= XFS_MAX_BLOCKSIZE); @@ -98,12 +101,13 @@ xfs_dir_mount( mp->m_dirdatablk = xfs_dir2_db_to_da(mp, XFS_DIR2_DATA_FIRSTDB(mp)); mp->m_dirleafblk = xfs_dir2_db_to_da(mp, XFS_DIR2_LEAF_FIRSTDB(mp)); mp->m_dirfreeblk = xfs_dir2_db_to_da(mp, XFS_DIR2_FREE_FIRSTDB(mp)); - mp->m_attr_node_ents = - (mp->m_sb.sb_blocksize - (uint)sizeof(xfs_da_node_hdr_t)) / - (uint)sizeof(xfs_da_node_entry_t); - mp->m_dir_node_ents = - (mp->m_dirblksize - (uint)sizeof(xfs_da_node_hdr_t)) / - (uint)sizeof(xfs_da_node_entry_t); + + nodehdr_size = __xfs_da3_node_hdr_size(xfs_sb_version_hascrc(&mp->m_sb)); + mp->m_attr_node_ents = (mp->m_sb.sb_blocksize - nodehdr_size) / + (uint)sizeof(xfs_da_node_entry_t); + mp->m_dir_node_ents = (mp->m_dirblksize - nodehdr_size) / + (uint)sizeof(xfs_da_node_entry_t); + mp->m_dir_magicpct = (mp->m_dirblksize * 37) / 100; if (xfs_sb_version_hasasciici(&mp->m_sb)) mp->m_dirnameops = &xfs_ascii_ci_nameops; -- cgit v1.2.3