wallet2: sanity check rct output distribution from the daemon

src/wallet/wallet2.cpp

@@ -6683,15 +6683,21 @@ void wallet2::get_outs(std::vector<std::vector<tools::wallet2::get_outs_entry>>
     uint64_t rct_start_height;
     std::vector<uint64_t> rct_offsets;
     bool has_rct = false;
+    uint64_t max_rct_index = 0;
     for (size_t idx: selected_transfers)
       if (m_transfers[idx].is_rct())
-        { has_rct = true; break; }
+      {
+        has_rct = true;
+        max_rct_index = std::max(max_rct_index, m_transfers[idx].m_global_output_index);
+      }
     const bool has_rct_distribution = has_rct && get_rct_distribution(rct_start_height, rct_offsets);
     if (has_rct_distribution)
     {
       // check we're clear enough of rct start, to avoid corner cases below
       THROW_WALLET_EXCEPTION_IF(rct_offsets.size() <= CRYPTONOTE_DEFAULT_TX_SPENDABLE_AGE,
           error::get_output_distribution, "Not enough rct outputs");
+      THROW_WALLET_EXCEPTION_IF(rct_offsets.back() <= max_rct_index,
+          error::get_output_distribution, "Daemon reports suspicious number of rct outputs");
     }
 
     // get histogram for the amounts we need