[JFFS2] check node crc before doing anything else

Check the node CRC on scan before doing anything else with the node.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c
index 7fb45bd..a5103df 100644 (file)
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -952,8 +952,7 @@ static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
                                 struct jffs2_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s)
 {
        struct jffs2_inode_cache *ic;
-       uint32_t ino = je32_to_cpu(ri->ino);
-       int err;
+       uint32_t crc, ino = je32_to_cpu(ri->ino);
 
        D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs));
 
@@ -966,21 +965,22 @@ static int jffs2_scan_inode_node(struct jffs2_sb_info *c, struct jffs2_erasebloc
           Which means that the _full_ amount of time to get to proper write mode with GC
           operational may actually be _longer_ than before. Sucks to be me. */
 
+       /* Check the node CRC in any case. */
+       crc = crc32(0, ri, sizeof(*ri)-8);
+       if (crc != je32_to_cpu(ri->node_crc)) {
+               printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on "
+                      "node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
+                      ofs, je32_to_cpu(ri->node_crc), crc);
+               /*
+                * We believe totlen because the CRC on the node
+                * _header_ was OK, just the node itself failed.
+                */
+               return jffs2_scan_dirty_space(c, jeb,
+                                             PAD(je32_to_cpu(ri->totlen)));
+       }
+
        ic = jffs2_get_ino_cache(c, ino);
        if (!ic) {
-               /* Inocache get failed. Either we read a bogus ino# or it's just genuinely the
-                  first node we found for this inode. Do a CRC check to protect against the former
-                  case */
-               uint32_t crc = crc32(0, ri, sizeof(*ri)-8);
-
-               if (crc != je32_to_cpu(ri->node_crc)) {
-                       printk(KERN_NOTICE "jffs2_scan_inode_node(): CRC failed on node at 0x%08x: Read 0x%08x, calculated 0x%08x\n",
-                              ofs, je32_to_cpu(ri->node_crc), crc);
-                       /* We believe totlen because the CRC on the node _header_ was OK, just the node itself failed. */
-                       if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(ri->totlen)))))
-                               return err;
-                       return 0;
-               }
                ic = jffs2_scan_make_ino_cache(c, ino);
                if (!ic)
                        return -ENOMEM;