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diff -up sudo-1.8.6p7/plugins/sudoers/match.c.segfault-null-group-list sudo-1.8.6p7/plugins/sudoers/match.c
--- sudo-1.8.6p7/plugins/sudoers/match.c.segfault-null-group-list 2016-05-11 10:22:29.201786896 +0200
+++ sudo-1.8.6p7/plugins/sudoers/match.c 2016-05-11 10:22:29.212786739 +0200
@@ -164,6 +164,9 @@ runaslist_matches(struct member_list *us
int group_matched = UNSPEC;
debug_decl(runaslist_matches, SUDO_DEBUG_MATCH)
+ if (user_list == NULL)user_list = ∅
+ if (group_list == NULL)group_list = ∅
+
if (runas_pw != NULL) {
/* If no runas user or runas group listed in sudoers, use default. */
if (tq_empty(user_list) && tq_empty(group_list))