linux-kernel - Re: [PATCH v2] tracing: check the return value of kstrdup()

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Date:   Wed, 5 Jan 2022 17:10:49 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     xkernel.wang@...mail.com
Cc:     mingo@...hat.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v2] tracing: check the return value of kstrdup()

Masami, can you ack this ?

-- Steve


On Tue, 14 Dec 2021 09:28:02 +0800
xkernel.wang@...mail.com wrote:

> From: Xiaoke Wang <xkernel.wang@...mail.com>
> 
> kstrdup() 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>
> ---
> Changelogs:
> Compare with the last email, this one is using my full name.
> And I am sorry that I did not notice the bugs in trace_boot.c had been
> already patched. So I removed the content about trace_boot.c.
> ---
>  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;