eth: ensure from<to when tracing chain (credits Chen Nan via bugbounty)

ethereum · Aug 21, 2018 · 106d196 · 106d196
1 parent 6d1e292
commit 106d196
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/eth/api_tracer.go b/eth/api_tracer.go
@@ -119,6 +119,9 @@ func (api *PrivateDebugAPI) TraceChain(ctx context.Context, start, end rpc.Block
 	if to == nil {
 		return nil, fmt.Errorf("end block #%d not found", end)
 	}
+	if from.Number().Cmp(to.Number()) >= 0 {
+		return nil, fmt.Errorf("end block (#%d) needs to come after start block (#%d)", end, start)
+	}
 	return api.traceChain(ctx, from, to, config)
 }