linux-kernel - [PATCH v6 1/3] tracing: eprobe: remove duplicate is_good

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Message-ID: <1655776787-18133-2-git-send-email-quic_linyyuan@quicinc.com>
Date:   Tue, 21 Jun 2022 09:59:45 +0800
From:   Linyu Yuan <quic_linyyuan@...cinc.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        Linyu Yuan <quic_linyyuan@...cinc.com>
Subject: [PATCH v6 1/3] tracing: eprobe: remove duplicate is_good_name() operation

traceprobe_parse_event_name() already validate SYSTEM and EVENT name,
there is no need to call is_good_name() after it.

Add trace_probe_log_set_index(1) to allow report correct error
if user input wrong SYSTEM.EVENT format.

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Linyu Yuan <quic_linyyuan@...cinc.com>
---
v2: drop v1 change as it is NACK.
    add it to remove duplicate is_good_name().
v3: move it as first patch.
v4: no change
v5: add Acked-by tag
v6: keep is_good_name() check for group and event name
    add trace_probe_log_set_index(1) to report correct error message.

 kernel/trace/trace_eprobe.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
index 7d44785..8979cb9e 100644
--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -881,13 +881,12 @@ static int __trace_eprobe_create(int argc, const char *argv[])
 	if (!is_good_name(event) || !is_good_name(group))
 		goto parse_error;
 
+	trace_probe_log_set_index(1);
 	sys_event = argv[1];
 	ret = traceprobe_parse_event_name(&sys_event, &sys_name, buf2,
 					  sys_event - argv[1]);
 	if (ret || !sys_name)
 		goto parse_error;
-	if (!is_good_name(sys_event) || !is_good_name(sys_name))
-		goto parse_error;
 
 	mutex_lock(&event_mutex);
 	event_call = find_and_get_event(sys_name, sys_event);
-- 
2.7.4