diff options
| author | sunliming <[email protected]> | 2023-06-06 14:20:24 +0800 |
|---|---|---|
| committer | Steven Rostedt (Google) <[email protected]> | 2023-06-14 12:41:52 -0400 |
| commit | 6f05dcabe5c241d066ec472cf38ac8b84f8c9c6f (patch) | |
| tree | 7c744fd135f87dc8819c77ef9b995ca52ee9aa88 | |
| parent | e70bb54d7a51299e7feca9169c07d79f9a3fc01d (diff) | |
tracing/user_events: Fix the incorrect trace record for empty arguments events
The user_events support events that has empty arguments. But the trace event
is discarded and not really committed when the arguments is empty. Fix this
by not attempting to copy in zero-length data.
Link: https://lkml.kernel.org/r/[email protected]
Acked-by: Beau Belgrave <[email protected]>
Acked-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: sunliming <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
| -rw-r--r-- | kernel/trace/trace_events_user.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/trace/trace_events_user.c b/kernel/trace/trace_events_user.c index afe61dc86543..49914b6cb651 100644 --- a/kernel/trace/trace_events_user.c +++ b/kernel/trace/trace_events_user.c @@ -1432,7 +1432,7 @@ static void user_event_ftrace(struct user_event *user, struct iov_iter *i, if (unlikely(!entry)) return; - if (unlikely(!copy_nofault(entry + 1, i->count, i))) + if (unlikely(i->count != 0 && !copy_nofault(entry + 1, i->count, i))) goto discard; if (!list_empty(&user->validators) && @@ -1473,7 +1473,7 @@ static void user_event_perf(struct user_event *user, struct iov_iter *i, perf_fetch_caller_regs(regs); - if (unlikely(!copy_nofault(perf_entry + 1, i->count, i))) + if (unlikely(i->count != 0 && !copy_nofault(perf_entry + 1, i->count, i))) goto discard; if (!list_empty(&user->validators) && |