libtracefs: Do not segfault in tests if synthetic events are not configured

Commit Message

Steven Rostedt May 30, 2023, 4:23 a.m. UTC

From: "Steven Rostedt (Google)" <[e-mail]>

If synthetic events are not configured in the kernel, the unit tests will
segfault and crash. Check if synthetic events exist and fail out nicely. The
tests will still fail if synthetic events are not configured, but they at least
will not crash.

Signed-off-by: Steven Rostedt (Google) <[e-mail]>
---
 utest/tracefs-utest.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Patch

diff --git a/utest/tracefs-utest.c b/utest/tracefs-utest.c
index 17fcac722fbc..9cfafdbd039c 100644
--- a/utest/tracefs-utest.c
+++ b/utest/tracefs-utest.c
@@ -994,7 +994,9 @@  static void test_synth_compare(struct test_synth *synth, struct tracefs_dynevent
 		stype = tracefs_dynevent_info(devents[i], NULL,
 					      &event, NULL, NULL, &format);
 		CU_TEST(stype == TRACEFS_DYNEVENT_SYNTH);
-		CU_TEST(strcmp(event, synth[i].name) == 0);
+		if (stype != TRACEFS_DYNEVENT_SYNTH)
+			continue;
+		CU_TEST(event && synth[i].name && strcmp(event, synth[i].name) == 0);
 		if (synth[i].match_name) {
 			CU_TEST(strstr(format, synth[i].match_name) != NULL);
 		}