Fix: sessiond ht_match_event() check if filter is NULL

[lttng-tools.git] / src / bin / lttng-sessiond / agent.c

diff --git a/src/bin/lttng-sessiond/agent.c b/src/bin/lttng-sessiond/agent.c
index 8e1ef0849fb13b4efb6c27e0e92c68d3fe71784d..7cbbbdee0dddfec3ef596b4d624031885fbf49b5 100644 (file)
--- a/src/bin/lttng-sessiond/agent.c
+++ b/src/bin/lttng-sessiond/agent.c
@@ -143,11 +143,18 @@ static int ht_match_event(struct cds_lfht_node *node,
        }
 
        /* Filter expression */
-       if (strncmp(event->filter_expression, key->filter_expression,
-                       strlen(event->filter_expression)) != 0) {
+       if (!!event->filter_expression ^ !!key->filter_expression) {
+               /* One has a filter expression, the other does not */
                goto no_match;
        }
 
+       if (event->filter_expression) {
+               if (strncmp(event->filter_expression, key->filter_expression,
+                               strlen(event->filter_expression)) != 0) {
+                       goto no_match;
+               }
+       }
+
        return 1;
 
 no_match: