linux-kernel - Re: [PATCH] perf script python: Fail check on dynamic allocation.

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Message-ID: <5a909795-bd93-4c33-9de4-729f45182427@intel.com>
Date:   Mon, 13 Nov 2023 09:44:15 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Paran Lee <p4ranlee@...il.com>, Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Li Dong <lidong@...o.com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        shjy180909@...il.com, austindh.kim@...il.com, honggyu.kp@...il.com
Subject: Re: [PATCH] perf script python: Fail check on dynamic allocation.

On 12/11/23 09:14, Paran Lee wrote:
> There is Ommitted PyList_New() Fail check
> and set_regs_in_dict(), python_start_script()
> dynamic allocation checking.
> 
> Signed-off-by: Paran Lee <p4ranlee@...il.com>

Please ensure patches compile before submitting.  Also run checkpatch
and fix any errors, and consider fixing warnings and checks.  Have a look
at checkpatch --strict also.

> ---
>  .../scripting-engines/trace-event-python.c     | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index 94312741443a..0847c50d4601 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -353,6 +353,8 @@ static PyObject *get_field_numeric_entry(struct tep_event *event,
>  
>  	if (is_array) {
>  		list = PyList_New(field->arraylen);
> +		if (!list)
> +			Py_FatalError("couldn't create Python list");
>  		item_size = field->size / field->arraylen;
>  		n_items = field->arraylen;
>  	} else {
> @@ -754,7 +756,7 @@ static void regs_map(struct regs_dump *regs, uint64_t mask, const char *arch, ch
>  	}
>  }
>  
> -static void set_regs_in_dict(PyObject *dict,
> +static int set_regs_in_dict(PyObject *dict,
>  			     struct perf_sample *sample,
>  			     struct evsel *evsel)
>  {
> @@ -770,6 +772,9 @@ static void set_regs_in_dict(PyObject *dict,
>  	 */
>  	int size = __sw_hweight64(attr->sample_regs_intr) * 28;
>  	char *bf = malloc(size);
> +	if (!bf)
> +		return -1;
> +	}
>  
>  	regs_map(&sample->intr_regs, attr->sample_regs_intr, arch, bf, size);
>  
> @@ -781,6 +786,8 @@ static void set_regs_in_dict(PyObject *dict,
>  	pydict_set_item_string_decref(dict, "uregs",
>  			_PyUnicode_FromString(bf));
>  	free(bf);
> +
> +	return 0;
>  }
>  
>  static void set_sym_in_dict(PyObject *dict, struct addr_location *al,
> @@ -920,7 +927,8 @@ static PyObject *get_perf_sample_dict(struct perf_sample *sample,
>  			PyLong_FromUnsignedLongLong(sample->cyc_cnt));
>  	}
>  
> -	set_regs_in_dict(dict, sample, evsel);
> +	if (!set_regs_in_dict(dict, sample, evsel))
> +		Py_FatalError("Failed to setting regs in dict");
>  
>  	return dict;
>  }
> @@ -1918,12 +1926,18 @@ static int python_start_script(const char *script, int argc, const char **argv,
>  	scripting_context->session = session;
>  #if PY_MAJOR_VERSION < 3
>  	command_line = malloc((argc + 1) * sizeof(const char *));
> +	if(!command_line) {
> +		return -1;
> +	}
>  	command_line[0] = script;
>  	for (i = 1; i < argc + 1; i++)
>  		command_line[i] = argv[i - 1];
>  	PyImport_AppendInittab(name, initperf_trace_context);
>  #else
>  	command_line = malloc((argc + 1) * sizeof(wchar_t *));
> +	if(!command_line) {
> +		return -1;
> +	}
>  	command_line[0] = Py_DecodeLocale(script, NULL);
>  	for (i = 1; i < argc + 1; i++)
>  		command_line[i] = Py_DecodeLocale(argv[i - 1], NULL);