Fix: don't access missing ctf trace when getting metadata

We can get metadata when still in the trace open functions, in which
case the ctf trace is not allocated nor available yet. This fixes a
segmentation fault in stress-test.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/formats/lttng-live/lttng-live-comm.c b/formats/lttng-live/lttng-live-comm.c
index 2b793e5f357ba30079b884a01d9df4a5a08295a7..8059b338b095dd4672021946ae497b3f8a45f7dd 100644 (file)
--- a/formats/lttng-live/lttng-live-comm.c
+++ b/formats/lttng-live/lttng-live-comm.c
@@ -607,6 +607,11 @@ int append_metadata(struct lttng_live_ctx *ctx,
        struct lttng_live_viewer_stream *metadata;
        char *metadata_buf = NULL;
 
+       if (!viewer_stream->ctf_trace->handle) {
+               printf_verbose("append_metadata: trace handle not ready yet.\n");
+               return 0;
+       }
+
        printf_verbose("get_next_index: new metadata needed\n");
        ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
        if (ret < 0) {