Merge pull request syslog-ng#5031 from HofiOne/modulesaffile-NULL-deference-5025

affile-dest: affile_dw_set_owner can be called with NULL owner that is not handled at all

Author: HofiOne

modules/affile/affile-dest.c

@@ -314,17 +314,20 @@ affile_dw_queue(LogPipe *s, LogMessage *lm, const LogPathOptions *path_options)
 static void
 affile_dw_set_owner(AFFileDestWriter *self, AFFileDestDriver *owner)
 {
-  GlobalConfig *cfg = log_pipe_get_config(&owner->super.super.super);
-
   if (self->owner)
     log_pipe_unref(&self->owner->super.super.super);
-  log_pipe_ref(&owner->super.super.super);
   self->owner = owner;
-  self->super.expr_node = owner->super.super.super.expr_node;
+  if (self->owner)
+    log_pipe_ref(&self->owner->super.super.super);
+
+  self->super.expr_node = self->owner ? self->owner->super.super.super.expr_node : NULL;
+  if (self->owner)
+    log_pipe_set_options(&self->super, &self->owner->super.super.super.options);
 
-  log_pipe_set_options(&self->super, &owner->super.super.super.options);
+  GlobalConfig *cfg = self->owner ? log_pipe_get_config(&self->owner->super.super.super) : NULL;
   log_pipe_set_config(&self->super, cfg);
-  if (self->writer)
+
+  if (self->writer && self->owner)
     {
       StatsClusterKeyBuilder *writer_sck_builder = stats_cluster_key_builder_new();
       stats_cluster_key_builder_add_label(writer_sck_builder, stats_cluster_label("driver", "file"));
@@ -333,7 +336,7 @@ affile_dw_set_owner(AFFileDestWriter *self, AFFileDestDriver *owner)
       log_pipe_set_config((LogPipe *) self->writer, cfg);
       log_writer_set_options(self->writer,
                              &self->super,
-                             &owner->writer_options,
+                             &self->owner->writer_options,
                              self->owner->super.super.id,
                              writer_sck_builder);
     }