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[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>
This commit is contained in:
Thomas Gleixner 2007-04-05 11:09:01 +02:00 committed by David Woodhouse
parent 873b6a2306
commit 53043002ef
1 changed files with 15 additions and 15 deletions
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30
fs/jffs2/scan.c
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@ -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_raw_inode *ri, uint32_t ofs, struct jffs2_summary *s)
{ {
struct jffs2_inode_cache *ic; struct jffs2_inode_cache *ic;
uint32_t ino = je32_to_cpu(ri->ino); uint32_t crc, ino = je32_to_cpu(ri->ino);
int err;
D1(printk(KERN_DEBUG "jffs2_scan_inode_node(): Node at 0x%08x\n", ofs)); 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 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. */ 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); ic = jffs2_get_ino_cache(c, ino);
if (!ic) { 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); ic = jffs2_scan_make_ino_cache(c, ino);
if (!ic) if (!ic)
return -ENOMEM; return -ENOMEM;