From c7258a4477b5ed0243c28ec107b98bb946757448 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Fri, 9 Mar 2007 11:44:00 +0000 Subject: [JFFS2] Check for all-zero node headers Due to a poor choice of CRC32 seed, a node header which is all zeroes would pass the CRC32 check. Explicitly check for this case, and treat it as we do a CRC failure. Signed-off-by: David Woodhouse --- fs/jffs2/scan.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'fs/jffs2/scan.c') diff --git a/fs/jffs2/scan.c b/fs/jffs2/scan.c index 31c1475d922a..7fb45bd4915c 100644 --- a/fs/jffs2/scan.c +++ b/fs/jffs2/scan.c @@ -734,6 +734,15 @@ 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) { -- cgit v1.2.3