Merge git://git.infradead.org/mtd-2.6

* git://git.infradead.org/mtd-2.6:
  [JFFS2] print a message when marking bad block
  [JFFS2] Check for all-zero node headers
  [MTD] [OneNAND] Classify the page data and oob buffer
  [MTD] [OneNAND] Exit the loop when transferring/filling of the oob is finished
  [MTD] [OneNAND] add Nokia Copyright and a credit
  [MTD] [OneNAND] Fix typo & wrong comments
  [MTD] [OneNAND] Use oob buffer instead of main one in oob functions
  [MTD] Correct partition failed erase address
  [JFFS2] Use yield() between GC passes in background thread.
  [MTD] [NAND] Correct misspelled preprocessor variable.
  [MTD] [MAPS] dilnetpc: Fix printk warning
  [MTD] [NOR] Fix oops in cfi_amdstd_sync
  [MTD] ESB2 check for closed ROM window
  [JFFS2] Fix writebuffer recovery in the first page of a block
  [MTD] [NAND] make oobavail public

1 files changed, 15 insertions, 1 deletions

diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index 58a0b912e9d0..717a48cf7df2 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -373,7 +373,14 @@ free_out:
 static inline int read_unknown(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref, struct jffs2_unknown_node *un)
 {
         /* We don't mark unknown nodes as REF_UNCHECKED */
-        BUG_ON(ref_flags(ref) == REF_UNCHECKED);
+        if (ref_flags(ref) == REF_UNCHECKED) {
+                JFFS2_ERROR("REF_UNCHECKED but unknown node at %#08x\n",
+                            ref_offset(ref));
+                JFFS2_ERROR("Node is {%04x,%04x,%08x,%08x}. Please report this error.\n",
+                            je16_to_cpu(un->magic), je16_to_cpu(un->nodetype),
+                            je32_to_cpu(un->totlen), je32_to_cpu(un->hdr_crc));
+                return 1;
+        }
 
         un->nodetype = cpu_to_je16(JFFS2_NODE_ACCURATE | je16_to_cpu(un->nodetype));
 
@@ -576,6 +583,13 @@ static int jffs2_get_inode_nodes(struct jffs2_sb_info *c, struct jffs2_inode_inf
                         jffs2_mark_node_obsolete(c, ref);
                         goto cont;
                 }
+                /* Due to poor choice of crc32 seed, an all-zero node will have a correct CRC */
+                if (!je32_to_cpu(node->u.hdr_crc) && !je16_to_cpu(node->u.nodetype) &&
+                    !je16_to_cpu(node->u.magic) && !je32_to_cpu(node->u.totlen)) {
+                        JFFS2_NOTICE("All zero node header at %#08x.\n", ref_offset(ref));
+                        jffs2_mark_node_obsolete(c, ref);
+                        goto cont;
+                }
 
                 switch (je16_to_cpu(node->u.nodetype)) {