rpc: Avoid "duplicate" return value for invalid submitblock

Author: MarcoFalke

src/rpc/mining.cpp

@@ -725,7 +725,6 @@ static UniValue submitblock(const JSONRPCRequest& request)
     }
 
     uint256 hash = block.GetHash();
-    bool fBlockPresent = false;
     {
         LOCK(cs_main);
         const CBlockIndex* pindex = LookupBlockIndex(hash);
@@ -736,8 +735,6 @@ static UniValue submitblock(const JSONRPCRequest& request)
             if (pindex->nStatus & BLOCK_FAILED_MASK) {
                 return "duplicate-invalid";
             }
-            // Otherwise, we might only have the header - process the block before returning
-            fBlockPresent = true;
         }
     }
 
@@ -749,13 +746,15 @@ static UniValue submitblock(const JSONRPCRequest& request)
         }
     }
 
+    bool new_block;
     submitblock_StateCatcher sc(block.GetHash());
     RegisterValidationInterface(&sc);
-    bool fAccepted = ProcessNewBlock(Params(), blockptr, true, nullptr);
+    bool accepted = ProcessNewBlock(Params(), blockptr, /* fForceProcessing */ true, /* fNewBlock */ &new_block);
     UnregisterValidationInterface(&sc);
-    if (fBlockPresent) {
-        if (fAccepted && !sc.found) {
-            return "duplicate-inconclusive";
+    if (!new_block) {
+        if (!accepted) {
+            // TODO Maybe pass down fNewBlock to AcceptBlockHeader, so it is properly set to true in this case?
+            return "invalid";
         }
         return "duplicate";
     }