linux-kernel - [PATCH v4 19/19] perf python: Correctly throw IndexError

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Message-Id: <20241029224431.167623-20-irogers@google.com>
Date: Tue, 29 Oct 2024 15:44:31 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Howard Chu <howardchu95@...il.com>, Athira Jajeev <atrajeev@...ux.vnet.ibm.com>, 
	Michael Petlan <mpetlan@...hat.com>, Veronika Molnarova <vmolnaro@...hat.com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>, Thomas Richter <tmricht@...ux.ibm.com>, 
	Ilya Leoshkevich <iii@...ux.ibm.com>, Colin Ian King <colin.i.king@...il.com>, 
	Weilin Wang <weilin.wang@...el.com>, Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org
Subject: [PATCH v4 19/19] perf python: Correctly throw IndexError

Correctly throw IndexError for out-of-bound accesses to evlist:
```
Python 3.11.9 (main, Jun 19 2024, 00:38:48) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path.insert(0, '/tmp/perf/python')
>>> import perf
>>> x=perf.parse_events('cycles')
>>> print(x)
evlist([cycles])
>>> x[2]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: Index out of range
```

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/python.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 0d71ec673aa3..25114dcadd21 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -1071,8 +1071,10 @@ static PyObject *pyrf_evlist__item(PyObject *obj, Py_ssize_t i)
 	struct pyrf_evlist *pevlist = (void *)obj;
 	struct evsel *pos;
 
-	if (i >= pevlist->evlist.core.nr_entries)
+	if (i >= pevlist->evlist.core.nr_entries) {
+		PyErr_SetString(PyExc_IndexError, "Index out of range");
 		return NULL;
+	}
 
 	evlist__for_each_entry(&pevlist->evlist, pos) {
 		if (i-- == 0)
-- 
2.47.0.163.g1226f6d8fa-goog