tools/xenstore: add helpers to free struct buffered_data

Add two helpers for freeing struct buffered_data: free_buffered_data()
for freeing one instance and conn_free_buffered_data() for freeing all
instances for a connection.

This is avoiding duplicated code and will help later when more actions
are needed when freeing a struct buffered_data.

This is part of XSA-326.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
(cherry picked from commit ead062a68a9c201a95488e84750a70a107f7b317)

diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index 249ad5ec6fb10a71d63f0fdbc23bb2ff7a88b730..527a1ebdededeb7276530be4e442caa5b7e6728d 100644 (file)
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -211,6 +211,21 @@ void reopen_log(void)
        }
 }
 
+static void free_buffered_data(struct buffered_data *out,
+                              struct connection *conn)
+{
+       list_del(&out->list);
+       talloc_free(out);
+}
+
+void conn_free_buffered_data(struct connection *conn)
+{
+       struct buffered_data *out;
+
+       while ((out = list_top(&conn->out_list, struct buffered_data, list)))
+               free_buffered_data(out, conn);
+}
+
 static bool write_messages(struct connection *conn)
 {
        int ret;
@@ -254,8 +269,7 @@ static bool write_messages(struct connection *conn)
 
        trace_io(conn, out, 1);
 
-       list_del(&out->list);
-       talloc_free(out);
+       free_buffered_data(out, conn);
 
        return true;
 }
@@ -1506,18 +1520,12 @@ static struct {
  */
 void ignore_connection(struct connection *conn)
 {
-       struct buffered_data *out, *tmp;
-
        trace("CONN %p ignored\n", conn);
 
        conn->is_ignored = true;
        conn_delete_all_watches(conn);
        conn_delete_all_transactions(conn);
-
-       list_for_each_entry_safe(out, tmp, &conn->out_list, list) {
-               list_del(&out->list);
-               talloc_free(out);
-       }
+       conn_free_buffered_data(conn);
 
        talloc_free(conn->in);
        conn->in = NULL;

diff --git a/tools/xenstore/xenstored_core.h b/tools/xenstore/xenstored_core.h
index 9af9af4390bdad7df610f5639791a59c08c7554f..e7ee87825c3be0d03c8ca9bf20946d2d6a4a47e7 100644 (file)
--- a/tools/xenstore/xenstored_core.h
+++ b/tools/xenstore/xenstored_core.h
@@ -276,6 +276,8 @@ int remember_string(struct hashtable *hash, const char *str);
 
 void set_tdb_key(const char *name, TDB_DATA *key);
 
+void conn_free_buffered_data(struct connection *conn);
+
 const char *dump_state_global(FILE *fp);
 const char *dump_state_buffered_data(FILE *fp, const struct connection *c,
                                     struct xs_state_connection *sc);

diff --git a/tools/xenstore/xenstored_domain.c b/tools/xenstore/xenstored_domain.c
index d03c7d93a9e767dd8f193239f1d98eec862ea5a8..93c4c1edcdd1f6dee123ba79984f70ba1b7156c0 100644 (file)
--- a/tools/xenstore/xenstored_domain.c
+++ b/tools/xenstore/xenstored_domain.c
@@ -411,15 +411,10 @@ static struct domain *find_domain_by_domid(unsigned int domid)
 static void domain_conn_reset(struct domain *domain)
 {
        struct connection *conn = domain->conn;
-       struct buffered_data *out;
 
        conn_delete_all_watches(conn);
        conn_delete_all_transactions(conn);
-
-       while ((out = list_top(&conn->out_list, struct buffered_data, list))) {
-               list_del(&out->list);
-               talloc_free(out);
-       }
+       conn_free_buffered_data(conn);
 
        talloc_free(conn->in);