linux-kernel - Re: [PATCH v2] tracing/probes: Fix memory leak in traceprobe_parse_probe_arg

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Date: Sat, 27 Apr 2024 08:36:17 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: LuMingYin <lumingyindetect@....com>, linux-trace-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tracing/probes: Fix memory leak in
 traceprobe_parse_probe_arg_body

I suggest to append parentheses to the function name in the summary phrase.

> If traceprobe_parse_probe_arg_body() fails to allocate 'parg->fmt', it
> jumps to 'out' instead of 'fail' by mistake. In the result, in this
> case the 'tmp' buffer is not freed and leaks its memory.
>
> Fix it by jumping to 'fail' in that case.

I propose to improve such a change description another bit like the following.

   If traceprobe_parse_probe_arg_body() failed to allocate the object “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.

Regards,
Markus