linux-kernel - Re: [PATCH V3 RESEND] perf script python: Fail check on dynamic allocation

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Message-ID: <ZVznJS+LF7fySGom@kernel.org>
Date:   Tue, 21 Nov 2023 14:21:41 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Paran Lee <p4ranlee@...il.com>, Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        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>, 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 V3 RESEND] perf script python: Fail check on dynamic
 allocation

Em Tue, Nov 21, 2023 at 09:39:12AM +0200, Adrian Hunter escreveu:
> On 21/11/23 00:32, Paran Lee wrote:
> > Add PyList_New() Fail check in get_field_numeric_entry()
> > function and dynamic allocation checking for
> > set_regs_in_dict(), python_start_script().
> > 
> > Signed-off-by: Paran Lee <p4ranlee@...il.com>
> > Reviewed-by: MichelleJin <shjy180909@...il.com>
> > Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>
> 
> I did not give a Reviewed-by tag.
> 
> Please never assume someone else's tag.  It breaks the process.
> 
> However, I have now reviewed it, so:
> 
> Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>

Thanks, applied.

- Arnaldo
 
> > ---
> >  .../util/scripting-engines/trace-event-python.c | 17 +++++++++++++++--
> >  1 file changed, 15 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..860e1837ba96 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 +772,8 @@ 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 +785,8 @@ 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 +926,8 @@ 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 +1925,18 @@ 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);
> 

-- 

- Arnaldo