--- ../download/linux-2.6.29-rc2-vanilla/fs/ext4/extents.c	2009-02-05 12:31:19.000000000 +0100
+++ fs/ext4/extents.c	2009-02-05 12:42:49.000000000 +0100
@@ -595,8 +595,15 @@
 	/* find extent */
 	ext4_ext_binsearch(inode, path + ppos, block);
 	/* if not an empty leaf */
-	if (path[ppos].p_ext)
+	if (path[ppos].p_ext) {
 		path[ppos].p_block = ext_pblock(path[ppos].p_ext);
+               if (path[ppos].p_block < EXT4_SB(inode->i_sb)->s_es->s_first_data_block
+                   || path[ppos].p_block + path[ppos].p_ext->ee_len
+                      >= ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) {
+                       printk("ext4_ext_find_extent: extent out of range\n");
+                       goto err;
+               }
+       }
 
 	ext4_ext_show_path(inode, path);