linux-kernel - Re: [PATCH v3] tracing/probes: Fix memory leak in traceprobe_parse_probe_arg

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Date: Mon, 29 Apr 2024 22:29:41 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: lumingyindetect@....com
Cc: linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
 rostedt@...dmis.org, mhiramat@...nel.org, mathieu.desnoyers@...icios.com
Subject: Re: [PATCH v3] tracing/probes: Fix memory leak in
 traceprobe_parse_probe_arg_body()

Hi LuMing,

On Sat, 27 Apr 2024 08:23:47 +0100
lumingyindetect@....com wrote:

> From: LuMingYin <lumingyindetect@....com>
> 
> If traceprobe_parse_probe_arg_body() failed to allocate 'parg->fmt',
> it jumps to the label 'out' instead of 'fail' by mistake.In the result,
> the buffer 'tmp' is not freed in this case and leaks its memory.
> 
> Thus jump to the label 'fail' in that error case.
> 

Looks good to me.

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


Thank you!

> Fixes: 032330abd08b ("tracing/probes: Cleanup probe argument parser")
> Signed-off-by: LuMingYin <lumingyindetect@....com>
> ---
>  kernel/trace/trace_probe.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
> index c09fa6fc636e..81c319b92038 100644
> --- a/kernel/trace/trace_probe.c
> +++ b/kernel/trace/trace_probe.c
> @@ -1466,7 +1466,7 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size,
>  		parg->fmt = kmalloc(len, GFP_KERNEL);
>  		if (!parg->fmt) {
>  			ret = -ENOMEM;
> -			goto out;
> +			goto fail;
>  		}
>  		snprintf(parg->fmt, len, "%s[%d]", parg->type->fmttype,
>  			 parg->count);
> -- 
> 2.25.1
> 
> 


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