diff options
| author | Joakim Tjernlund <joakim.tjernlund@transmode.se> | 2007-03-10 17:08:44 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2007-04-25 04:13:06 +0100 |
| commit | 0dec4c8bc6ed62a65b61594aa754e21270423796 (patch) | |
| tree | 42f4f16e9173fc75aa27e69510b9b4e123122d30 | |
| parent | df8e96f39103adf5a13332d784040a2c62667243 (diff) | |
| download | linux-0dec4c8bc6ed62a65b61594aa754e21270423796.tar.gz linux-0dec4c8bc6ed62a65b61594aa754e21270423796.tar.bz2 linux-0dec4c8bc6ed62a65b61594aa754e21270423796.zip | |
[JFFS2] Better fix for all-zero node headers
No need to check for all-zero header since the header cannot
be zero due to other checks.
Replace the all-zero header check in readinode.c with a
check for the magic word.
Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
| -rw-r--r-- | fs/jffs2/readinode.c | 8 | ||||
| -rw-r--r-- | fs/jffs2/scan.c | 12 |
2 files changed, 5 insertions, 15 deletions
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c index 49d4b0a67c55..b09fa23abe53 100644 --- a/fs/jffs2/readinode.c +++ b/fs/jffs2/readinode.c @@ -1054,10 +1054,10 @@ 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)); + if (je16_to_cpu(node->u.magic) != JFFS2_MAGIC_BITMASK) { + /* Not a JFFS2 node, whinge and move on */ + JFFS2_NOTICE("Wrong magic bitmask 0x%04x in node header at %#08x.\n", + je16_to_cpu(node->u.magic), ref_offset(ref)); jffs2_mark_node_obsolete(c, ref); goto cont; } diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c index 7a46a436edfc..858e3ed8e23d 100644 --- a/fs/jffs2/scan.c +++ b/fs/jffs2/scan.c @@ -741,18 +741,8 @@ scan_more: ofs += 4; continue; } - /* Due to poor choice of crc32 seed, an all-zero node will have a correct CRC */ - if (!je32_to_cpu(node->hdr_crc) && !je16_to_cpu(node->nodetype) && - !je16_to_cpu(node->magic) && !je32_to_cpu(node->totlen)) { - noisy_printk(&noise, "jffs2_scan_eraseblock(): All zero node header at 0x%08x.\n", ofs); - if ((err = jffs2_scan_dirty_space(c, jeb, 4))) - return err; - ofs += 4; - continue; - } - if (ofs + je32_to_cpu(node->totlen) > - jeb->offset + c->sector_size) { + if (ofs + je32_to_cpu(node->totlen) > jeb->offset + c->sector_size) { /* Eep. Node goes over the end of the erase block. */ printk(KERN_WARNING "Node at 0x%08x with length 0x%08x would run over the end of the erase block\n", ofs, je32_to_cpu(node->totlen)); |