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[for-linus,03/15] tracing/user_events: Handle matching arguments that is null from dyn_events

Message ID 20230615133415.275901907@goodmis.org
State New
Headers
Series tracing: Updates for 6.4 |

Commit Message

Steven Rostedt June 15, 2023, 1:05 p.m. UTC 
  From: sunliming <sunliming@kylinos.cn>

When A registering user event from dyn_events has no argments, it will pass the
matching check, regardless of whether there is a user event with the same name
and arguments. Add the matching check when the arguments of registering user
event is null.

Link: https://lore.kernel.org/linux-trace-kernel/20230529065110.303440-1-sunliming@kylinos.cn

Signed-off-by: sunliming <sunliming@kylinos.cn>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
 kernel/trace/trace_events_user.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c
index 37a38496a6be..afe61dc86543 100644
--- a/kernel/trace/trace_events_user.c
+++ b/kernel/trace/trace_events_user.c
@@ -1745,6 +1745,8 @@  static bool user_event_match(const char *system, const char *event,
 
 	if (match && argc > 0)
 		match = user_fields_match(user, argc, argv);
+	else if (match && argc == 0)
+		match = list_empty(&user->fields);
 
 	return match;
 }