Coinbase transactions can not have shielded spend or output

src/main.cpp

@@ -1171,6 +1171,14 @@ bool CheckTransactionWithoutProofVerification(const CTransaction& tx, CValidatio
             return state.DoS(100, error("CheckTransaction(): coinbase has joinsplits"),
                              REJECT_INVALID, "bad-cb-has-joinsplits");
 
+        // A coinbase transaction cannot have spend descriptions or output descriptions
+        if (tx.vShieldedSpend.size() > 0)
+            return state.DoS(100, error("CheckTransaction(): coinbase has spend descriptions"),
+                             REJECT_INVALID, "bad-cb-has-spend-description");
+        if (tx.vShieldedOutput.size() > 0)
+            return state.DoS(100, error("CheckTransaction(): coinbase has output descriptions"),
+                             REJECT_INVALID, "bad-cb-has-output-description");
+
         if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100)
             return state.DoS(100, error("CheckTransaction(): coinbase script size"),
                              REJECT_INVALID, "bad-cb-length");

src/test/transaction_tests.cpp

@@ -438,6 +438,28 @@ void test_simple_sapling_invalidity(uint32_t consensusBranchId, CMutableTransact
 
         BOOST_CHECK(CheckTransactionWithoutProofVerification(newTx, state));
     }
+    {
+        CMutableTransaction newTx(tx);
+        CValidationState state;
+
+        // Create a coinbase transaction
+        CTxIn vin;
+        vin.prevout = COutPoint();
+        newTx.vin.push_back(vin);
+        CTxOut vout;
+        vout.nValue = 1;
+        newTx.vout.push_back(vout);
+
+        newTx.vShieldedOutput.push_back(OutputDescription());
+
+        BOOST_CHECK(!CheckTransactionWithoutProofVerification(newTx, state));
+        BOOST_CHECK(state.GetRejectReason() == "bad-cb-has-output-description");
+
+        newTx.vShieldedSpend.push_back(SpendDescription());
+
+        BOOST_CHECK(!CheckTransactionWithoutProofVerification(newTx, state));
+        BOOST_CHECK(state.GetRejectReason() == "bad-cb-has-spend-description");
+    }
 }
 
 void test_simple_joinsplit_invalidity(uint32_t consensusBranchId, CMutableTransaction tx)