From a01d5876fa6a9a9fe28cff3ad3ed0e91d5612125 Mon Sep 17 00:00:00 2001
From: s_nakamoto <s_nakamoto@1a98c847-1fd6-4fd8-948a-caf3550aa51b>
Date: Mon, 16 Aug 2010 17:51:10 +0000
Subject: [PATCH] erase the bad chain after disconnecting it

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@138 1a98c847-1fd6-4fd8-948a-caf3550aa51b
---
 db.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/db.cpp b/db.cpp
index 8134a9059..c6127a318 100644
--- a/db.cpp
+++ b/db.cpp
@@ -460,9 +460,12 @@ bool CTxDB::LoadBlockIndex()
     ReadBestInvalidWork(bnBestInvalidWork);
 
     // Verify blocks in the best chain
+    vector<CBlockIndex*> vChain;
+    vector<CBlockIndex*> vBad;
     CBlockIndex* pindexFork = NULL;
     for (CBlockIndex* pindex = pindexBest; pindex && pindex->pprev; pindex = pindex->pprev)
     {
+        vChain.push_back(pindex);
         CBlock block;
         if (!block.ReadFromDisk(pindex))
             return error("LoadBlockIndex() : block.ReadFromDisk failed");
@@ -470,6 +473,7 @@ bool CTxDB::LoadBlockIndex()
         {
             printf("LoadBlockIndex() : *** found bad block at %d, hash=%s\n", pindex->nHeight, pindex->GetBlockHash().ToString().c_str());
             pindexFork = pindex->pprev;
+            vBad = vChain;
         }
     }
     if (pindexFork)
@@ -480,6 +484,14 @@ bool CTxDB::LoadBlockIndex()
             return error("LoadBlockIndex() : block.ReadFromDisk failed");
         CTxDB txdb;
         block.SetBestChain(txdb, pindexFork);
+
+        // Delete the bad chain
+        foreach(CBlockIndex* pindex, vBad)
+        {
+            txdb.EraseBlockIndex(pindex->GetBlockHash());
+            mapBlockIndex.erase(pindex->GetBlockHash());
+            delete pindex;
+        }
     }
 
     return true;