linux-kernel - Re: [PATCH] tracing: check the return value of kstrndup()

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Message-ID: <20220105171112.337844b9@gandalf.local.home>
Date:   Wed, 5 Jan 2022 17:11:12 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     xkernel.wang@...mail.com
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH] tracing: check the return value of kstrndup()

Masami, can you ack this?

-- Steve


On Tue, 14 Dec 2021 10:26:46 +0800
xkernel.wang@...mail.com wrote:

> From: Xiaoke Wang <xkernel.wang@...mail.com>
> 
> kstrndup() is a memory allocation-related function, it returns NULL when
> some internal memory errors happen. It is better to check the return
> value of it so to catch the memory error in time.
> 
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
> ---
>  kernel/trace/trace_probe.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
> index 3ed2a3f..bb4605b 100644
> --- a/kernel/trace/trace_probe.c
> +++ b/kernel/trace/trace_probe.c
> @@ -356,6 +356,8 @@ static int __parse_imm_string(char *str, char **pbuf, int offs)
>  		return -EINVAL;
>  	}
>  	*pbuf = kstrndup(str, len - 1, GFP_KERNEL);
> +	if (!*pbuf)
> +		return -ENOMEM;
>  	return 0;
>  }
>