From 71e3fb8941ddeaa6af0cc833e51e8149f475990d Mon Sep 17 00:00:00 2001
From: arvidn <arvid@cs.umu.se>
Date: Mon, 7 Mar 2016 23:40:01 -0500
Subject: [PATCH] fix division by zero in super-seeding logic

---
 ChangeLog       | 2 ++
 src/torrent.cpp | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index e5db9c4ba..798542c40 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -86,6 +86,8 @@
 	* almost completely changed the storage interface (for custom storage)
 	* added support for hashing pieces in multiple threads
 
+	* fix division by zero in super-seeding logic
+
 1.0.9 release
 
 	* fix issue in checking outgoing interfaces (when that option is enabled)
diff --git a/src/torrent.cpp b/src/torrent.cpp
index 7b11f071f..ea9a1638c 100644
--- a/src/torrent.cpp
+++ b/src/torrent.cpp
@@ -5002,6 +5002,9 @@ namespace libtorrent
 		// seeded by any peer
 		TORRENT_ASSERT(m_super_seeding);
 
+		if (!need_loaded())
+			return -1;
+
 		// do a linear search from the first piece
 		int min_availability = 9999;
 		std::vector<int> avail_vec;
@@ -5034,6 +5037,7 @@ namespace libtorrent
 			avail_vec.push_back(i);
 		}
 
+		if (avail_vec.empty()) return -1;
 		return avail_vec[random() % avail_vec.size()];
 	}