diff -U0 ./ChangeLog.old ./ChangeLog
--- ./ChangeLog.old	2009-06-14 14:31:31.659446202 -0700
+++ ./ChangeLog	2009-06-14 14:31:48.369321893 -0700
@@ -2,0 +3 @@
+	* fixed torrent file path vulnerability
diff -up ./src/torrent_info.cpp.old ./src/torrent_info.cpp
--- ./src/torrent_info.cpp.old	2009-06-14 14:31:38.315506116 -0700
+++ ./src/torrent_info.cpp	2009-06-14 14:43:22.349322362 -0700
@@ -37,6 +37,8 @@ POSSIBILITY OF SUCH DAMAGE.
 #include <iterator>
 #include <algorithm>
 #include <set>
+#include <string>
+#include <cassert>
 
 #ifdef _MSC_VER
 #pragma warning(push, 1)
@@ -68,6 +69,30 @@ namespace
 		str += 0x80 | (chr & 0x3f);
 	}
 
+	bool valid_path_element(std::string const& element)
+	{
+		if (element.empty()
+			|| element == "." || element == ".."
+			|| element[0] == '/' || element[0] == '\\'
+			|| element[element.size()-1] == ':')
+			return false;
+		return true;
+	}
+
+	namespace fs = boost::filesystem;
+	fs::path sanitize_path(fs::path const& p)
+	{
+		fs::path new_path;
+		for (fs::path::const_iterator i = p.begin(); i != p.end(); ++i)
+		{
+			if (!valid_path_element(*i)) continue;
+			std::string pe = *i;
+			new_path /= pe;
+		}
+		assert(!new_path.is_complete());
+		return new_path;
+	}
+
 	void verify_encoding(file_entry& target)
 	{
 		std::string tmp_path;
@@ -178,9 +202,9 @@ namespace
 		for (entry::list_type::const_iterator i = list->begin();
 			i != list->end(); ++i)
 		{
-			if (i->string() != "..")
-				target.path /= i->string();
+			target.path /= i->string();
 		}
+		target.path = sanitize_path(target.path);
 		verify_encoding(target);
 		if (target.path.is_complete()) throw std::runtime_error("torrent contains "
 			"a file with an absolute path: '"
@@ -310,11 +334,9 @@ namespace libtorrent
 		else
 		{ m_name = info["name"].string(); }
 		
-		path tmp = m_name;
-		if (tmp.is_complete()) throw std::runtime_error("torrent contains "
-			"a file with an absolute path: '" + m_name + "'");
-		if (tmp.has_branch_path()) throw std::runtime_error(
-			"torrent contains name with directories: '" + m_name + "'");
+		m_name = sanitize_path(m_name).string();
+		if (!valid_path_element(m_name))
+			throw std::runtime_error("invalid 'name' of torrent (possible exploit attempt)");
 	
 		// extract file list
 		entry const* i = info.find_key("files");