check accessing an element past the end of a container

4 files changed, 30 insertions, 7 deletions

diff --git a/src/wallet/api/unsigned_transaction.cpp b/src/wallet/api/unsigned_transaction.cpp
index 4c8c5ade2..d22719189 100644
--- a/src/wallet/api/unsigned_transaction.cpp
+++ b/src/wallet/api/unsigned_transaction.cpp
@@ -293,6 +293,10 @@ std::vector<std::string> UnsignedTransactionImpl::recipientAddress() const
     // TODO: return integrated address if short payment ID exists
     std::vector<string> result;
     for (const auto &utx: m_unsigned_tx_set.txes) {
+        if (utx.dests.empty()) {
+          MERROR("empty destinations, skipped");
+          continue;
+        }
         result.push_back(cryptonote::get_account_address_as_str(m_wallet.m_wallet->testnet(), utx.dests[0].is_subaddress, utx.dests[0].addr));
     }
     return result;
diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 6746f376d..e818f576a 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -540,6 +540,11 @@ crypto::hash8 get_short_payment_id(const tools::wallet2::pending_tx &ptx)
   {
     if(get_encrypted_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id8))
     {
+      if (ptx.dests.empty())
+      {
+        MWARNING("Encrypted payment id found, but no destinations public key, cannot decrypt");
+        return crypto::null_hash8;
+      }
       decrypt_payment_id(payment_id8, ptx.dests[0].addr.m_view_public_key, ptx.tx_key); 
     }
   }
@@ -4050,6 +4055,11 @@ crypto::hash wallet2::get_payment_id(const pending_tx &ptx) const
     crypto::hash8 payment_id8 = null_hash8;
     if(get_encrypted_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id8))
     {
+      if (ptx.dests.empty())
+      {
+        MWARNING("Encrypted payment id found, but no destinations public key, cannot decrypt");
+        return crypto::null_hash;
+      }
       if (decrypt_payment_id(payment_id8, ptx.dests[0].addr.m_view_public_key, ptx.tx_key))
       {
         memcpy(payment_id.data, payment_id8.data, 8);
@@ -4274,6 +4284,7 @@ bool wallet2::sign_tx(unsigned_tx_set &exported_txs, const std::string &signed_f
   for (size_t n = 0; n < exported_txs.txes.size(); ++n)
   {
     tools::wallet2::tx_construction_data &sd = exported_txs.txes[n];
+    THROW_WALLET_EXCEPTION_IF(sd.sources.empty(), error::wallet_internal_error, "Empty sources");
     LOG_PRINT_L1(" " << (n+1) << ": " << sd.sources.size() << " inputs, ring size " << sd.sources[0].outputs.size());
     signed_txes.ptx.push_back(pending_tx());
     tools::wallet2::pending_tx &ptx = signed_txes.ptx.back();
@@ -6637,7 +6648,7 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
       LOG_PRINT_L2("Made a " << ((txBlob.size() + 1023) / 1024) << " kB tx, with " << print_money(available_for_fee) << " available for fee (" <<
         print_money(needed_fee) << " needed)");
 
-      if (needed_fee > available_for_fee && dsts[0].amount > 0)
+      if (needed_fee > available_for_fee && !dsts.empty() && dsts[0].amount > 0)
       {
         // we don't have enough for the fee, but we've only partially paid the current address,
         // so we can take the fee from the paid amount, since we'll have to make another tx anyway
@@ -8912,6 +8923,7 @@ uint64_t wallet2::get_blockchain_height_by_date(uint16_t year, uint8_t month, ui
       throw std::runtime_error(oss.str());
     }
     cryptonote::block blk_min, blk_mid, blk_max;
+    if (res.blocks.size() < 3) throw std::runtime_error("Not enough blocks returned from daemon");
     if (!parse_and_validate_block_from_blob(res.blocks[0].block, blk_min)) throw std::runtime_error("failed to parse blob at height " + std::to_string(height_min));
     if (!parse_and_validate_block_from_blob(res.blocks[1].block, blk_mid)) throw std::runtime_error("failed to parse blob at height " + std::to_string(height_mid));
     if (!parse_and_validate_block_from_blob(res.blocks[2].block, blk_max)) throw std::runtime_error("failed to parse blob at height " + std::to_string(height_max));
diff --git a/src/wallet/wallet_rpc_server.cpp b/src/wallet/wallet_rpc_server.cpp
index baf8086f8..ccb7b4bc7 100644
--- a/src/wallet/wallet_rpc_server.cpp
+++ b/src/wallet/wallet_rpc_server.cpp
@@ -486,7 +486,7 @@ namespace tools
     return true;
   }
   //------------------------------------------------------------------------------------------------------------------------------
-  bool wallet_rpc_server::validate_transfer(const std::list<wallet_rpc::transfer_destination>& destinations, const std::string& payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, epee::json_rpc::error& er)
+  bool wallet_rpc_server::validate_transfer(const std::list<wallet_rpc::transfer_destination>& destinations, const std::string& payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, bool at_least_one_destination, epee::json_rpc::error& er)
   {
     crypto::hash8 integrated_payment_id = crypto::null_hash8;
     std::string extra_nonce;
@@ -541,6 +541,13 @@ namespace tools
       }
     }
 
+    if (at_least_one_destination && dsts.empty())
+    {
+      er.code = WALLET_RPC_ERROR_CODE_ZERO_DESTINATION;
+      er.message = "No destinations for this transfer";
+      return false;
+    }
+
     if (!payment_id.empty())
     {
 
@@ -592,7 +599,7 @@ namespace tools
     }
 
     // validate the transfer requested and populate dsts & extra
-    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, er))
+    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, true, er))
     {
       return false;
     }
@@ -690,7 +697,7 @@ namespace tools
     }
 
     // validate the transfer requested and populate dsts & extra; RPC_TRANSFER::request and RPC_TRANSFER_SPLIT::request are identical types.
-    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, er))
+    if (!validate_transfer(req.destinations, req.payment_id, dsts, extra, true, er))
     {
       return false;
     }
@@ -887,7 +894,7 @@ namespace tools
     destination.push_back(wallet_rpc::transfer_destination());
     destination.back().amount = 0;
     destination.back().address = req.address;
-    if (!validate_transfer(destination, req.payment_id, dsts, extra, er))
+    if (!validate_transfer(destination, req.payment_id, dsts, extra, true, er))
     {
       return false;
     }
@@ -986,7 +993,7 @@ namespace tools
     destination.push_back(wallet_rpc::transfer_destination());
     destination.back().amount = 0;
     destination.back().address = req.address;
-    if (!validate_transfer(destination, req.payment_id, dsts, extra, er))
+    if (!validate_transfer(destination, req.payment_id, dsts, extra, true, er))
     {
       return false;
     }
diff --git a/src/wallet/wallet_rpc_server.h b/src/wallet/wallet_rpc_server.h
index 79f589623..b2061fa35 100644
--- a/src/wallet/wallet_rpc_server.h
+++ b/src/wallet/wallet_rpc_server.h
@@ -137,7 +137,7 @@ namespace tools
       bool on_create_account(const wallet_rpc::COMMAND_RPC_CREATE_ACCOUNT::request& req, wallet_rpc::COMMAND_RPC_CREATE_ACCOUNT::response& res, epee::json_rpc::error& er);
       bool on_label_account(const wallet_rpc::COMMAND_RPC_LABEL_ACCOUNT::request& req, wallet_rpc::COMMAND_RPC_LABEL_ACCOUNT::response& res, epee::json_rpc::error& er);
       bool on_getheight(const wallet_rpc::COMMAND_RPC_GET_HEIGHT::request& req, wallet_rpc::COMMAND_RPC_GET_HEIGHT::response& res, epee::json_rpc::error& er);
-      bool validate_transfer(const std::list<wallet_rpc::transfer_destination>& destinations, const std::string& payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, epee::json_rpc::error& er);
+      bool validate_transfer(const std::list<wallet_rpc::transfer_destination>& destinations, const std::string& payment_id, std::vector<cryptonote::tx_destination_entry>& dsts, std::vector<uint8_t>& extra, bool at_least_one_destination, epee::json_rpc::error& er);
       bool on_transfer(const wallet_rpc::COMMAND_RPC_TRANSFER::request& req, wallet_rpc::COMMAND_RPC_TRANSFER::response& res, epee::json_rpc::error& er);
       bool on_transfer_split(const wallet_rpc::COMMAND_RPC_TRANSFER_SPLIT::request& req, wallet_rpc::COMMAND_RPC_TRANSFER_SPLIT::response& res, epee::json_rpc::error& er);
       bool on_sweep_dust(const wallet_rpc::COMMAND_RPC_SWEEP_DUST::request& req, wallet_rpc::COMMAND_RPC_SWEEP_DUST::response& res, epee::json_rpc::error& er);