From 14705cd417cbb1cd6c685922c1348a8572b95866 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Mon, 22 Oct 2018 20:12:45 +0000
Subject: [PATCH] ultrascan: bail early if there are no probes in the current
 scan

This shouldn't ever happen, but it currently does for host discovery
scans using -PR where the target is not directly connected. See #1361
---
 scan_engine.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scan_engine.cc b/scan_engine.cc
index 342f0963e..c71a524c2 100644
--- a/scan_engine.cc
+++ b/scan_engine.cc
@@ -2730,6 +2730,13 @@ void ultra_scan(std::vector<Target *> &Targets, struct scan_lists *ports,
 
   UltraScanInfo USI(Targets, ports, scantype);
 
+  if (USI.gstats->numprobes <= 0) {
+    if (o.debugging) {
+      log_write(LOG_STDOUT, "Skipping %s: no probes to send\n", scantype2str(scantype));
+    }
+    return;
+  }
+
   /* Use the requested timeouts. */
   if (to != NULL)
     USI.gstats->to = *to;