From: Dave Chinner <dchinner@redhat.com> mainline inclusion from mainline-v6.4-rc5 commit 3148ebf2c0782340946732bfaf3073d23ac833fa category: bugfix bugzilla: 188883, https://gitee.com/openeuler/kernel/issues/I76JSK CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- If the agfl or the indexing in the AGF has been corrupted, getting a block form the AGFL could return an invalid block number. If this happens, bad things happen. Check the agbno we pull off the AGFL and return -EFSCORRUPTED if we find somethign bad. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Dave Chinner <david@fromorbit.com> Conflicts: fs/xfs/libxfs/xfs_alloc.c Signed-off-by: Long Li <leo.lilong@huawei.com> --- fs/xfs/libxfs/xfs_alloc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index 1079c98e166c..7ffccfc1320c 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -2748,6 +2748,10 @@ xfs_alloc_get_freelist( */ agfl_bno = xfs_buf_to_agfl_bno(agflbp); bno = be32_to_cpu(agfl_bno[be32_to_cpu(agf->agf_flfirst)]); + if (XFS_IS_CORRUPT(tp->t_mountp, + !xfs_verify_agbno(mp, be32_to_cpu(agf->agf_seqno), bno))) + return -EFSCORRUPTED; + be32_add_cpu(&agf->agf_flfirst, 1); xfs_trans_brelse(tp, agflbp); if (be32_to_cpu(agf->agf_flfirst) == xfs_agfl_size(mp)) -- 2.31.1