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

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Message-Id: <20220106074027.c67476cd8cb8d4b11e49a534@kernel.org>
Date:   Thu, 6 Jan 2022 07:40:27 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     xkernel.wang@...mail.com, mingo@...hat.com,
        linux-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH] tracing: check the return value of kstrndup()

On Wed, 5 Jan 2022 17:11:12 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> Masami, can you ack this?

Yes, thanks for fowarding.

> 
> -- 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.

Thanks for fixing!

Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Fixes: a42e3c4de964 ("tracing/probe: Add immediate string parameter support")


> > 
> > 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;
> >  }
> >  
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>