xfs: check owner of dir3 free blocks

Check the owner field of dir3 free block headers and reject the metadata
if there's something wrong with it.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --git a/fs/xfs/libxfs/xfs_dir2_node.c b/fs/xfs/libxfs/xfs_dir2_node.c
index bbd478ec75c902b5879e468477fa63c157293218..6ac4aad98cd76c4f31286ba916638b2efda19f5a 100644 (file)
--- a/fs/xfs/libxfs/xfs_dir2_node.c
+++ b/fs/xfs/libxfs/xfs_dir2_node.c
@@ -194,6 +194,8 @@ xfs_dir3_free_header_check(
                        return __this_address;
                if (be32_to_cpu(hdr3->nvalid) < be32_to_cpu(hdr3->nused))
                        return __this_address;
+               if (be64_to_cpu(hdr3->hdr.owner) != dp->i_ino)
+                       return __this_address;
        } else {
                struct xfs_dir2_free_hdr *hdr = bp->b_addr;