X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Flib%2Flttng-ctl%2Flttng-ctl.c;h=2d84aad90238904440f377eae0d945f59c0ecb20;hp=f6fadcb6adaadb16ccb21cb2fb0ad752581b1050;hb=66de3f4d3dc05e3bf5a1c59a47f0e3cacc2eee7e;hpb=72592aa4c220c945c0a3b4920e2e51b6efd3d77c

diff --git a/src/lib/lttng-ctl/lttng-ctl.c b/src/lib/lttng-ctl/lttng-ctl.c
index f6fadcb6a..2d84aad90 100644
--- a/src/lib/lttng-ctl/lttng-ctl.c
+++ b/src/lib/lttng-ctl/lttng-ctl.c
@@ -2575,6 +2575,9 @@ int lttng_list_tracker_pids(struct lttng_handle *handle,
 		return ret;
 	}
 	nr_pids = ret / sizeof(int32_t);
+	if (nr_pids > 0 && !pids) {
+		return -LTTNG_ERR_UNK;
+	}
 	if (nr_pids == 1 && pids[0] == -1) {
 		free(pids);
 		pids = NULL;