Fix: Missing rcu_read_lock in cmd_snapshot_list_outputs()

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bin/lttng-sessiond/cmd.c b/src/bin/lttng-sessiond/cmd.c
index 2c6f6f4a7bcb443d4a7e6638e489bd04d395e8bc..0b97ed61a1ec54fc928b1e5a69890ede4002a162 100644 (file)
--- a/src/bin/lttng-sessiond/cmd.c
+++ b/src/bin/lttng-sessiond/cmd.c
@@ -2796,7 +2796,7 @@ ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
                struct lttng_snapshot_output **outputs)
 {
        int ret, idx = 0;
-       struct lttng_snapshot_output *list;
+       struct lttng_snapshot_output *list = NULL;
        struct lttng_ht_iter iter;
        struct snapshot_output *output;
 
@@ -2810,7 +2810,7 @@ ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
         * set in no output mode.
         */
        if (session->output_traces) {
-               ret = LTTNG_ERR_EPERM;
+               ret = -LTTNG_ERR_EPERM;
                goto error;
        }
 
@@ -2821,11 +2821,12 @@ ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
 
        list = zmalloc(session->snapshot.nb_output * sizeof(*list));
        if (!list) {
-               ret = LTTNG_ERR_NOMEM;
+               ret = -LTTNG_ERR_NOMEM;
                goto error;
        }
 
        /* Copy list from session to the new list object. */
+       rcu_read_lock();
        cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
                        output, node.node) {
                assert(output->consumer);
@@ -2840,28 +2841,28 @@ ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
                        ret = uri_to_str_url(&output->consumer->dst.net.control,
                                        list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
                        if (ret < 0) {
-                               ret = LTTNG_ERR_NOMEM;
-                               goto free_error;
+                               ret = -LTTNG_ERR_NOMEM;
+                               goto error;
                        }
 
                        /* Data URI. */
                        ret = uri_to_str_url(&output->consumer->dst.net.data,
                                        list[idx].data_url, sizeof(list[idx].data_url));
                        if (ret < 0) {
-                               ret = LTTNG_ERR_NOMEM;
-                               goto free_error;
+                               ret = -LTTNG_ERR_NOMEM;
+                               goto error;
                        }
                }
                idx++;
        }
 
        *outputs = list;
-       return session->snapshot.nb_output;
-
-free_error:
-       free(list);
+       list = NULL;
+       ret = session->snapshot.nb_output;
 error:
-       return -ret;
+       free(list);
+       rcu_read_unlock();
+       return ret;
 }
 
 /*