diff -rup linux/fs/reiserfs/file.c linux.patched/fs/reiserfs/file.c
--- linux/fs/reiserfs/file.c	Thu Nov 15 16:29:50 2001
+++ linux.patched/fs/reiserfs/file.c	Thu Nov 15 16:29:26 2001
@@ -109,6 +109,12 @@ static int reiserfs_setattr(struct dentr
 	}
     }
 
+    if ((((attr->ia_valid & ATTR_UID) && (attr->ia_uid & ~0xffff)) ||
+	 ((attr->ia_valid & ATTR_GID) && (attr->ia_gid & ~0xffff))) &&
+	(get_inode_sd_version (inode) == STAT_DATA_V1))
+		/* stat data of format v3.5 has 16 bit uid and gid */
+	    return -EINVAL;
+
     error = inode_change_ok(inode, attr) ;
     if (!error)
         inode_setattr(inode, attr) ;
diff -rup linux/fs/reiserfs/inode.c linux.patched/fs/reiserfs/inode.c
--- linux/fs/reiserfs/inode.c	Thu Nov 15 16:29:50 2001
+++ linux.patched/fs/reiserfs/inode.c	Thu Nov 15 16:14:21 2001
@@ -219,7 +219,7 @@ static inline void set_block_dev_mapped 
 // files which were created in the earlier version can not be longer,
 // than 2 gb
 //
-int file_capable (struct inode * inode, long block)
+static int file_capable (struct inode * inode, long block)
 {
     if (get_inode_item_key_version (inode) != KEY_FORMAT_3_5 || // it is new file.
 	block < (1 << (31 - inode->i_sb->s_blocksize_bits))) // old file, but 'block' is inside of 2gb
@@ -1517,9 +1517,16 @@ struct inode * reiserfs_new_inode (struc
 
     INIT_LIST_HEAD(&inode->u.reiserfs_i.i_prealloc_list) ;
 
-    if (old_format_only (sb))
+    if (old_format_only (sb)) {
+	if (inode->i_uid & ~0xffff || inode->i_gid & ~0xffff) {
+	    pathrelse (&path_to_key);
+	    /* i_uid or i_gid is too big to be stored in stat data v3.5 */
+	    iput (inode);
+	    *err = -EINVAL;
+	    return NULL;
+	}
 	inode2sd_v1 (&sd, inode);
-    else
+    } else
 	inode2sd (&sd, inode);
 
     // these do not go to on-disk stat data

.