fix crash: createmultisig and addmultisigaddress

Rebased-From: e5d9d77
Github-Pull: #5706

Author: fsb4000

src/rpcmisc.cpp

@@ -213,6 +213,8 @@ CScript _createmultisig_redeemScript(const Array& params)
         throw runtime_error(
             strprintf("not enough keys supplied "
                       "(got %u keys, but need at least %d to redeem)", keys.size(), nRequired));
+    if (keys.size() > 16)
+        throw runtime_error("Number of addresses involved in the multisignature address creation > 16\nReduce the number");
     std::vector<CPubKey> pubkeys;
     pubkeys.resize(keys.size());
     for (unsigned int i = 0; i < keys.size(); i++)