Merge #9549: [net] Avoid possibility of NULL pointer dereference in MarkBlockAsInFlight(...)

95543d8 [net] Avoid possibility of NULL pointer dereference in MarkBlockAsInFlight(...) (practicalswift)

Tree-SHA512: 80fd4f2712f20377185bd8d319255f2c54ae47b54c706f7e0d384a0a6ade1465ceb6e2a4a7f7b51987a659524474a954eddf228865ebb3fc513948b5b6d7ab6d

Author: sipa

src/net_processing.cpp

@@ -342,7 +342,9 @@ bool MarkBlockAsInFlight(NodeId nodeid, const uint256& hash, const CBlockIndex*
     // Short-circuit most stuff in case its from the same node
     std::map<uint256, std::pair<NodeId, std::list<QueuedBlock>::iterator> >::iterator itInFlight = mapBlocksInFlight.find(hash);
     if (itInFlight != mapBlocksInFlight.end() && itInFlight->second.first == nodeid) {
-        *pit = &itInFlight->second.second;
+        if (pit) {
+            *pit = &itInFlight->second.second;
+        }
         return false;
     }