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[JFFS2] Check for all-zero node headers

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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 <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse
2007-03-09 11:44:00 +00:00
parent 470bc84436
commit c7258a4477
2 changed files with 24 additions and 1 deletions
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9
fs/jffs2/scan.c
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@ -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) {