From 2074fed6642713bcdfdc76f379956e97663ab8d0 Mon Sep 17 00:00:00 2001 From: Nick Mathewson Date: Wed, 28 Aug 2019 11:51:16 -0400 Subject: [PATCH] Routerset config parsing: represent empty sets as NULL. routerset_t has two representations of an empty routerset: NULL, and a set containing no elements. But some of our config code assumes that empty routersets are represented as NULL. So let's give it what it assumes. Fixes bug 31495. Bugfix on e16b90b88a76; but not in any released Tor. --- src/feature/nodelist/routerset.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/src/feature/nodelist/routerset.c b/src/feature/nodelist/routerset.c index 76777847ef..12965ad0d8 100644 --- a/src/feature/nodelist/routerset.c +++ b/src/feature/nodelist/routerset.c @@ -479,6 +479,10 @@ routerset_kv_parse(void *target, const config_line_t *line, char **errmsg, *errmsg = tor_strdup("Invalid router list."); return -1; } else { + if (routerset_is_empty(rs)) { + /* Represent empty sets as NULL. */ + routerset_free(rs); + } *p = rs; return 0; } @@ -507,8 +511,10 @@ routerset_copy(void *dest, const void *src, const void *params) routerset_t **output = (routerset_t**)dest; const routerset_t *input = *(routerset_t**)src; routerset_free(*output); // sets *output to NULL - *output = routerset_new(); - routerset_union(*output, input); + if (! routerset_is_empty(input)) { + *output = routerset_new(); + routerset_union(*output, input); + } return 0; }