linux-kernel - [PATCH 6.0 157/862] tracing/eprobe: Fix alloc event dir failed when event name no set

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Date:   Wed, 19 Oct 2022 10:24:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Linyu Yuan <quic_linyyuan@...cinc.com>,
        "Masami Hiramatsu (Google)" <mhiramat@...nel.org>,
        Tao Chen <chentao.kernel@...ux.alibaba.com>,
        "Steven Rostedt (Google)" <rostedt@...dmis.org>
Subject: [PATCH 6.0 157/862] tracing/eprobe: Fix alloc event dir failed when event name no set

From: Tao Chen <chentao.kernel@...ux.alibaba.com>

commit dc399adecd4e2826868e5d116a58e33071b18346 upstream.

The event dir will alloc failed when event name no set, using the
command:
"echo "e:esys/ syscalls/sys_enter_openat file=\$filename:string"
>> dynamic_events"
It seems that dir name="syscalls/sys_enter_openat" is not allowed
in debugfs. So just use the "sys_enter_openat" as the event name.

Link: https://lkml.kernel.org/r/1664028814-45923-1-git-send-email-chentao.kernel@linux.alibaba.com

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Tom Zanussi <zanussi@...nel.org>
Cc: Linyu Yuan <quic_linyyuan@...cinc.com>
Cc: Tao Chen <chentao.kernel@...ux.alibaba.com
Cc: stable@...r.kernel.org
Fixes: 95c104c378dc ("tracing: Auto generate event name when creating a group of events")
Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Tao Chen <chentao.kernel@...ux.alibaba.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 kernel/trace/trace_eprobe.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/trace/trace_eprobe.c
+++ b/kernel/trace/trace_eprobe.c
@@ -968,8 +968,7 @@ static int __trace_eprobe_create(int arg
 	}
 
 	if (!event) {
-		strscpy(buf1, argv[1], MAX_EVENT_NAME_LEN);
-		sanitize_event_name(buf1);
+		strscpy(buf1, sys_event, MAX_EVENT_NAME_LEN);
 		event = buf1;
 	}