linux-kernel - [PATCH v3 02/15] perf stat: Avoid buffer overflow to the aggregation map

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Message-ID: <20250719030517.1990983-3-irogers@google.com>
Date: Fri, 18 Jul 2025 20:05:04 -0700
From: Ian Rogers <irogers@...gle.com>
To: Thomas Falcon <thomas.falcon@...el.com>, 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>, Ravi Bangoria <ravi.bangoria@....com>, 
	James Clark <james.clark@...aro.org>, Dapeng Mi <dapeng1.mi@...ux.intel.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 v3 02/15] perf stat: Avoid buffer overflow to the aggregation map

CPUs may be created and passed to perf_stat__get_aggr (via
config->aggr_get_id), such as in the stat display
should_skip_zero_counter. There may be no such aggr_id, for example,
if running with a thread. Add a missing bound check and just create
IDs for these cases.

Reviewed-by: Thomas Falcon <thomas.falcon@...el.com>
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-stat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 77e2248fa7fc..73b4521ab8af 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1365,7 +1365,7 @@ static struct aggr_cpu_id perf_stat__get_aggr(struct perf_stat_config *config,
 	struct aggr_cpu_id id;
 
 	/* per-process mode - should use global aggr mode */
-	if (cpu.cpu == -1)
+	if (cpu.cpu == -1 || cpu.cpu >= config->cpus_aggr_map->nr)
 		return get_id(config, cpu);
 
 	if (aggr_cpu_id__is_empty(&config->cpus_aggr_map->map[cpu.cpu]))
-- 
2.50.0.727.gbf7dc18ff4-goog