From e6c99a7ab9834d2ba74ea2d0f681e595b3f26fe8 Mon Sep 17 00:00:00 2001
From: jl777 <jameslee777@yahoo.com>
Date: Sat, 21 Apr 2018 23:06:56 +0300
Subject: [PATCH] Split out no previndex from invalid prevblock

---
 src/main.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index 03262b0fe..ca86aa5e9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -4001,14 +4001,17 @@ bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBloc
     }
     // Get prev block index
     CBlockIndex* pindexPrev = NULL;
-    if (hash != chainparams.GetConsensus().hashGenesisBlock) {
+    if (hash != chainparams.GetConsensus().hashGenesisBlock)
+    {
         BlockMap::iterator mi = mapBlockIndex.find(block.hashPrevBlock);
         if (mi == mapBlockIndex.end())
         {
             return state.DoS(10, error("%s: prev block not found", __func__), 0, "bad-prevblk");
         }
         pindexPrev = (*mi).second;
-        if (pindexPrev == 0 || (pindexPrev->nStatus & BLOCK_FAILED_MASK) )
+        if (pindexPrev == 0 )
+            return(false);
+        if ( (pindexPrev->nStatus & BLOCK_FAILED_MASK) )
             return state.DoS(100, error("%s: prev block invalid", __func__), REJECT_INVALID, "bad-prevblk");
     }
     if (!ContextualCheckBlockHeader(block, state, pindexPrev))