Merge pull request #6567

2016576 Fix crash when mining with empty keypool. (Daniel Kraft)

2 files changed, 9 insertions, 3 deletions

diff --git a/src/miner.cpp b/src/miner.cpp
index 4172266067..9dd1d459b5 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -444,8 +444,10 @@ void static BitcoinMiner(const CChainParams& chainparams)
     GetMainSignals().ScriptForMining(coinbaseScript);
 
     try {
-        //throw an error if no script was provided
-        if (!coinbaseScript->reserveScript.size())
+        // Throw an error if no script was provided.  This can happen
+        // due to some internal error but also if the keypool is empty.
+        // In the latter case, already the pointer is NULL.
+        if (!coinbaseScript || coinbaseScript->reserveScript.empty())
             throw std::runtime_error("No coinbase script available (mining requires a wallet)");
 
         while (true) {
diff --git a/src/rpcmining.cpp b/src/rpcmining.cpp
index b7d4ff58fc..620a46be15 100644
--- a/src/rpcmining.cpp
+++ b/src/rpcmining.cpp
@@ -138,8 +138,12 @@ UniValue generate(const UniValue& params, bool fHelp)
     boost::shared_ptr<CReserveScript> coinbaseScript;
     GetMainSignals().ScriptForMining(coinbaseScript);
 
+    // If the keypool is exhausted, no script is returned at all.  Catch this.
+    if (!coinbaseScript)
+        throw JSONRPCError(RPC_WALLET_KEYPOOL_RAN_OUT, "Error: Keypool ran out, please call keypoolrefill first");
+
     //throw an error if no script was provided
-    if (!coinbaseScript->reserveScript.size())
+    if (coinbaseScript->reserveScript.empty())
         throw JSONRPCError(RPC_INTERNAL_ERROR, "No coinbase script available (mining requires a wallet)");
 
     {   // Don't keep cs_main locked