[mod_magnet] fix memory leak

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2943 152afb58-edef-0310-8abb-c4023f1b3aa9

NEWS

@@ -9,6 +9,7 @@ NEWS
   * [mod_rrdtool] fix invalid read (string not null terminated)
   * [mod_dirlisting] fix memory leak if pcre fails
   * [mod_fastcgi,mod_scgi] fix resource leaks on spawning backends
+  * [mod_magnet] fix memory leak
 
 - 1.4.34
   * [mod_auth] explicitly link ssl for SHA1 (fixes #2517)

src/mod_magnet.c

@@ -786,10 +786,12 @@ static int magnet_attach_content(server *srv, connection *con, plugin_data *p, l
 						}
 
 						if (off < 0) {
+							buffer_free(fn);
 							return luaL_error(L, "offset for '%s' is negative", fn->ptr);
 						}
 
 						if (len < off) {
+							buffer_free(fn);
 							return luaL_error(L, "offset > length for '%s'", fn->ptr);
 						}