From 94fa50b44f5b23a075df80bfd4854865ca0b649b Mon Sep 17 00:00:00 2001

From: Lennart Poettering <lennart@poettering.net>

Date: Mon, 18 May 2015 23:23:17 +0200

Subject: [PATCH] resolved: fix crash when shutting down

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Reported by Cristian Rodríguez

http://lists.freedesktop.org/archives/systemd-devel/2015-May/031626.html

(cherry picked from commit cab5b05903096e1c9cf5575ccc73f89d15c8db69)

---

 src/resolve/resolved-dns-cache.c  |  4 +---

 src/resolve/resolved-dns-server.c | 15 ++++++++-------

 src/resolve/resolved-link.c       |  6 +++---

 src/resolve/resolved-manager.c    |  4 ++--

 src/shared/prioq.c                |  6 ++++--

 src/shared/prioq.h                |  2 +-

 6 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c

index 33ca4d1a45..874207cfb8 100644

--- a/src/resolve/resolved-dns-cache.c

+++ b/src/resolve/resolved-dns-cache.c

@@ -93,9 +93,7 @@ void dns_cache_flush(DnsCache *c) {

         hashmap_free(c->by_key);

         c->by_key = NULL;

-

-        prioq_free(c->by_expiry);

-        c->by_expiry = NULL;

+        c->by_expiry = prioq_free(c->by_expiry);

 }

 static void dns_cache_remove(DnsCache *c, DnsResourceKey *key) {

diff --git a/src/resolve/resolved-dns-server.c b/src/resolve/resolved-dns-server.c

index caf06fe450..9a62a63258 100644

--- a/src/resolve/resolved-dns-server.c

+++ b/src/resolve/resolved-dns-server.c

@@ -78,23 +78,24 @@ DnsServer* dns_server_free(DnsServer *s)  {

         if (!s)

                 return NULL;

-        if (s->manager) {

+        if (s->link) {

                 if (s->type == DNS_SERVER_LINK)

                         LIST_REMOVE(servers, s->link->dns_servers, s);

-                else if (s->type == DNS_SERVER_SYSTEM)

+

+                if (s->link->current_dns_server == s)

+                        link_set_dns_server(s->link, NULL);

+        }

+

+        if (s->manager) {

+                if (s->type == DNS_SERVER_SYSTEM)

                         LIST_REMOVE(servers, s->manager->dns_servers, s);

                 else if (s->type == DNS_SERVER_FALLBACK)

                         LIST_REMOVE(servers, s->manager->fallback_dns_servers, s);

-                else

-                        assert_not_reached("Unknown server type");

                 if (s->manager->current_dns_server == s)

                         manager_set_dns_server(s->manager, NULL);

         }

-        if (s->link && s->link->current_dns_server == s)

-                link_set_dns_server(s->link, NULL);

-

         free(s);

         return NULL;

diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c

index f94e4bb6f0..27d9129e00 100644

--- a/src/resolve/resolved-link.c

+++ b/src/resolve/resolved-link.c

@@ -68,13 +68,13 @@ Link *link_free(Link *l) {

         if (l->manager)

                 hashmap_remove(l->manager->links, INT_TO_PTR(l->ifindex));

+        while (l->dns_servers)

+                dns_server_free(l->dns_servers);

+

         dns_scope_free(l->unicast_scope);

         dns_scope_free(l->llmnr_ipv4_scope);

         dns_scope_free(l->llmnr_ipv6_scope);

-        while (l->dns_servers)

-                dns_server_free(l->dns_servers);

-

         free(l);

         return NULL;

 }

diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c

index b5ad701611..7c253aa13f 100644

--- a/src/resolve/resolved-manager.c

+++ b/src/resolve/resolved-manager.c

@@ -536,11 +536,11 @@ Manager *manager_free(Manager *m) {

         while (m->dns_queries)

                 dns_query_free(m->dns_queries);

-        dns_scope_free(m->unicast_scope);

-

         manager_flush_dns_servers(m, DNS_SERVER_SYSTEM);

         manager_flush_dns_servers(m, DNS_SERVER_FALLBACK);

+        dns_scope_free(m->unicast_scope);

+

         hashmap_free(m->links);

         hashmap_free(m->dns_transactions);

diff --git a/src/shared/prioq.c b/src/shared/prioq.c

index 8af4c51c2f..b89888be0e 100644

--- a/src/shared/prioq.c

+++ b/src/shared/prioq.c

@@ -45,12 +45,14 @@ Prioq *prioq_new(compare_func_t compare_func) {

         return q;

 }

-void prioq_free(Prioq *q) {

+Prioq* prioq_free(Prioq *q) {

         if (!q)

-                return;

+                return NULL;

         free(q->items);

         free(q);

+

+        return NULL;

 }

 int prioq_ensure_allocated(Prioq **q, compare_func_t compare_func) {

diff --git a/src/shared/prioq.h b/src/shared/prioq.h

index d836b36cd9..1c044b135c 100644

--- a/src/shared/prioq.h

+++ b/src/shared/prioq.h

@@ -28,7 +28,7 @@ typedef struct Prioq Prioq;

 #define PRIOQ_IDX_NULL ((unsigned) -1)

 Prioq *prioq_new(compare_func_t compare);

-void prioq_free(Prioq *q);

+Prioq *prioq_free(Prioq *q);

 int prioq_ensure_allocated(Prioq **q, compare_func_t compare_func);

 int prioq_put(Prioq *q, void *data, unsigned *idx);