Zero all new block allocations.

Make sure all new block allocations (from allocate_block)
are zeroed.  It can happen that junk from previous hive pages
can end up in new block allocations, if the hive previously
shrank.

(Thanks to Marko Myllynen for finding an example where this
happened).

diff --git a/lib/hivex.c b/lib/hivex.c
index ef3cba7..74a7f55 100644 (file)
--- a/lib/hivex.c
+++ b/lib/hivex.c
@@ -1860,6 +1860,8 @@ allocate_block (hive_h *h, size_t seg_len, const char id[2])
   struct ntreg_hbin_block *blockhdr =
     (struct ntreg_hbin_block *) (h->addr + offset);
 
+  memset (blockhdr, 0, seg_len);
+
   blockhdr->seg_len = htole32 (- (int32_t) seg_len);
   if (id[0] && id[1] && seg_len >= sizeof (struct ntreg_hbin_block)) {
     blockhdr->id[0] = id[0];