From 6a96c5650568a2218712d43ec16f3f82296a6c53 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Fri, 23 Mar 2018 10:06:56 -0700 Subject: xfs: don't accept inode buffers with suspicious unlinked chains When we're verifying inode buffers, sanity-check the unlinked pointer. We don't want to run the risk of trying to purge something that's obviously broken. Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster --- fs/xfs/libxfs/xfs_inode_buf.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c index cdd4c1d58e80..f0cfcd79ac39 100644 --- a/fs/xfs/libxfs/xfs_inode_buf.c +++ b/fs/xfs/libxfs/xfs_inode_buf.c @@ -93,20 +93,26 @@ xfs_inode_buf_verify( bool readahead) { struct xfs_mount *mp = bp->b_target->bt_mount; + xfs_agnumber_t agno; int i; int ni; /* * Validate the magic number and version of every inode in the buffer */ + agno = xfs_daddr_to_agno(mp, XFS_BUF_ADDR(bp)); ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock; for (i = 0; i < ni; i++) { int di_ok; xfs_dinode_t *dip; + xfs_agino_t unlinked_ino; dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog)); + unlinked_ino = be32_to_cpu(dip->di_next_unlinked); di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) && - xfs_dinode_good_version(mp, dip->di_version); + xfs_dinode_good_version(mp, dip->di_version) && + (unlinked_ino == NULLAGINO || + xfs_verify_agino(mp, agno, unlinked_ino)); if (unlikely(XFS_TEST_ERROR(!di_ok, mp, XFS_ERRTAG_ITOBP_INOTOBP))) { if (readahead) { @@ -124,9 +130,9 @@ xfs_inode_buf_verify( xfs_buf_verifier_error(bp, -EFSCORRUPTED, __func__, dip, sizeof(*dip), NULL); + return; } } - xfs_inobp_check(mp, bp); } -- cgit v1.2.3-58-ga151