fix crash in session::get_ip_filter when not having set one

ChangeLog

@@ -1,5 +1,6 @@
 1.1.1 release
 
+	* fix crash in session::get_ip_filter when not having set one
 	* fix filename escaping when repairing torrents with broken web seeds
 	* fix bug where file_completed_alert would not be posted unless file_progress
 	  had been queries by the client

src/session_impl.cpp

@@ -1239,6 +1239,7 @@ namespace aux {
 	ip_filter const& session_impl::get_ip_filter()
 	{
 		TORRENT_ASSERT(is_single_thread());
+		if (!m_ip_filter) m_ip_filter = boost::make_shared<ip_filter>();
 		return *m_ip_filter;
 	}
 

test/test_ip_filter.cpp

@@ -35,6 +35,7 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #include "test.hpp"
 #include "libtorrent/socket_io.hpp"
+#include "libtorrent/session.hpp"
 
 /*
 
@@ -89,6 +90,18 @@ void test_rules_invariant(std::vector<ip_range<T> > const& r, ip_filter const& f
 	}
 }
 
+TORRENT_TEST(session_get_ip_filter)
+{
+	using namespace libtorrent;
+	session ses;
+	ip_filter const& ipf = ses.get_ip_filter();
+#if TORRENT_USE_IPV6
+	TEST_EQUAL(boost::get<0>(ipf.export_filter()).size(), 1);
+#else
+	TEST_EQUAL(ipf.export_filter().size(), 1);
+#endif
+}
+
 TORRENT_TEST(ip_filter)
 {
 	using namespace libtorrent;