linux-kernel - Re: [PATCH] tracing: Fix wrong return in kprobe_event_gen

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Message-Id: <20230201003753.d844d26d902169ee64b979d4@kernel.org>
Date:   Wed, 1 Feb 2023 00:37:53 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Anton Gusev <aagusev@...ras.ru>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing: Fix wrong return in kprobe_event_gen_test.c

On Tue, 31 Jan 2023 10:58:18 +0300
Anton Gusev <aagusev@...ras.ru> wrote:

> Overwriting the error code with the deletion result may cause the
> function to return 0 despite encountering an error. Commit b111545d26c0
> ("tracing: Remove the useless value assignment in
> test_create_synth_event()") solves a similar issue by
> returning the original error code, so this patch does the same.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Signed-off-by: Anton Gusev <aagusev@...ras.ru>

Oops, thanks for the fix!

Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

> ---
>  kernel/trace/kprobe_event_gen_test.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/trace/kprobe_event_gen_test.c b/kernel/trace/kprobe_event_gen_test.c
> index c736487fc0e4..e0c420eb0b2b 100644
> --- a/kernel/trace/kprobe_event_gen_test.c
> +++ b/kernel/trace/kprobe_event_gen_test.c
> @@ -146,7 +146,7 @@ static int __init test_gen_kprobe_cmd(void)
>  	if (trace_event_file_is_valid(gen_kprobe_test))
>  		gen_kprobe_test = NULL;
>  	/* We got an error after creating the event, delete it */
> -	ret = kprobe_event_delete("gen_kprobe_test");
> +	kprobe_event_delete("gen_kprobe_test");
>  	goto out;
>  }
>  
> @@ -211,7 +211,7 @@ static int __init test_gen_kretprobe_cmd(void)
>  	if (trace_event_file_is_valid(gen_kretprobe_test))
>  		gen_kretprobe_test = NULL;
>  	/* We got an error after creating the event, delete it */
> -	ret = kprobe_event_delete("gen_kretprobe_test");
> +	kprobe_event_delete("gen_kretprobe_test");
>  	goto out;
>  }
>  
> -- 
> 2.39.1
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>