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tracing/user_events: Fix the incorrect trace record for empty arguments events

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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/20230606062027.1008398-2-sunliming@kylinos.cn

Acked-by: Beau Belgrave <beaub@linux.microsoft.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: sunliming <sunliming@kylinos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
sunliming
2023-06-06 14:20:24 +08:00
committed by Steven Rostedt (Google)
parent e70bb54d7a
commit 6f05dcabe5
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/trace_events_user.c
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@@ -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) &&