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

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Message-ID: <20211213115206.5a7b9f0c@gandalf.local.home>
Date:   Mon, 13 Dec 2021 11:52:06 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Xiaoke Wang <xkernel.wang@...mail.com>
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH] tracing: check the return value of kstrdup()

On Mon, 13 Dec 2021 15:59:04 +0800
Xiaoke Wang <xkernel.wang@...mail.com> wrote:

> Note: Compare with the last email, this one is using my full name.
> And I am sorry that yesterday I did not notice the bugs in trace_boot.c had been
> already patched.
> kstrdup() returns NULL when some internal memory errors happen, it is
> better to check the return value of it.

Can you please resend this as a normal patch, and not a reply to this email
thread.

Thank you,

-- Steve


> 
> Signed-off-by: Xiaoke Wang <xkernel.wang@...mail.com>
> ---
>  kernel/trace/trace_uprobe.c | 5 +++++
>  1 files changed, 5 insertions(+)
> 
> diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
> index 225ce56..173ff0f 100644
> --- a/kernel/trace/trace_uprobe.c
> +++ b/kernel/trace/trace_uprobe.c
> @@ -1618,6 +1618,11 @@ create_local_trace_uprobe(char *name, unsigned long offs,
>  	tu->path = path;
>  	tu->ref_ctr_offset = ref_ctr_offset;
>  	tu->filename = kstrdup(name, GFP_KERNEL);
> +	if (!tu->filename) {
> +		ret = -ENOMEM;
> +		goto error;
> +	}
> +
>  	init_trace_event_call(tu);
>  
>  	ptype = is_ret_probe(tu) ? PROBE_PRINT_RETURN : PROBE_PRINT_NORMAL;