linux-kernel - [PATCH] perf stat: allocation check when calculating cache instance ID

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Message-Id: <20240527090300.17864-1-yskelg@gmail.com>
Date: Mon, 27 May 2024 18:03:02 +0900
From: yskelg@...il.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>,
	"Liang, Kan" <kan.liang@...ux.intel.com>
Cc: Gautham Shenoy <gautham.shenoy@....com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	skhan@...uxfoundation.org,
	Austin Kim <austindh.kim@...il.com>,
	shjy180909@...il.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	Yunseong Kim <yskelg@...il.com>
Subject: [PATCH] perf stat: allocation check when calculating cache instance ID

From: Yunseong Kim <yskelg@...il.com>

Adds an allocation check for cpu_map before perf_cpu_map__min() accessing

Signed-off-by: Yunseong Kim <yskelg@...il.com>
---
 tools/perf/builtin-stat.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 35f79b48e8dc..1f238824abb2 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1291,20 +1291,22 @@ static struct option stat_options[] = {
  */
 static int cpu__get_cache_id_from_map(struct perf_cpu cpu, char *map)
 {
-	int id;
+	int id = cpu.cpu;
 	struct perf_cpu_map *cpu_map = perf_cpu_map__new(map);
 
-	/*
-	 * If the map contains no CPU, consider the current CPU to
-	 * be the first online CPU in the cache domain else use the
-	 * first online CPU of the cache domain as the ID.
-	 */
-	id = perf_cpu_map__min(cpu_map).cpu;
-	if (id == -1)
-		id = cpu.cpu;
+	if (cpu_map) {
+		/*
+		 * If the map contains no CPU, consider the current CPU to
+		 * be the first online CPU in the cache domain else use the
+		 * first online CPU of the cache domain as the ID.
+		 */
+		id = perf_cpu_map__min(cpu_map).cpu;
+		if (id == -1)
+			id = cpu.cpu;
 
-	/* Free the perf_cpu_map used to find the cache ID */
-	perf_cpu_map__put(cpu_map);
+		/* Free the perf_cpu_map used to find the cache ID */
+		perf_cpu_map__put(cpu_map);
+	}
 
 	return id;
 }
-- 
2.34.1