Fix: undefined operation on last_relay_viewer_session_id

[lttng-tools.git] / src / bin / lttng-relayd / live.c

diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c
index f86670e9c618de16958d4e49bf41d2995026f70f..81b90939c9e713570ef34670ce3524d3cd9c8bc1 100644 (file)
--- a/src/bin/lttng-relayd/live.c
+++ b/src/bin/lttng-relayd/live.c
@@ -732,7 +732,12 @@ int viewer_connect(struct relay_connection *conn)
        reply.major = htobe32(reply.major);
        reply.minor = htobe32(reply.minor);
        if (conn->type == RELAY_VIEWER_COMMAND) {
-               reply.viewer_session_id = htobe64(++last_relay_viewer_session_id);
+               /*
+                * Increment outside of htobe64 macro, because can be used more than once
+                * within the macro, and thus the operation may be undefined.
+                */
+               last_relay_viewer_session_id++;
+               reply.viewer_session_id = htobe64(last_relay_viewer_session_id);
        }
 
        health_code_update();