* grub-core/fs/ext2.c (grub_ext2_read_block): Support large sparse chunks.

ChangeLog

@@ -1,3 +1,8 @@
+2014-12-07  Peter Nelson <peterdn>
+
+	* grub-core/fs/ext2.c (grub_ext2_read_block): Support large sparse
+	chunks.
+
 2014-12-07  Andrei Borzenkov  <arvidjaar@gmail.com>
 
 	* util/grub-mkconfig_lib.in (version_test_gt): Remove redundant

grub-core/fs/ext2.c

@@ -484,6 +484,10 @@ grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
 
 indirect:
   do {
+    /* If the indirect block is zero, all child blocks are absent
+       (i.e. filled with zeros.) */
+    if (indir == 0)
+      return 0;
     if (grub_disk_read (data->disk,
 			((grub_disk_addr_t) grub_le_to_cpu32 (indir))
 			<< log2_blksz,