linux-kernel - [PATCH v2] perf pmu: Avoid segv for missing name/alias

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Message-ID: <20250527215035.187992-1-irogers@google.com>
Date: Tue, 27 May 2025 14:50:35 -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>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] perf pmu: Avoid segv for missing name/alias_name in wildcarding

The pmu name or alias_name fields may be NULL and should be skipped if
so. This is done in all loops of perf_pmu___name_match except the
final wildcard loop which was an oversight.

Fixes: c786468a3585 ("perf pmu: Rename name matching for no suffix or wildcard variants")
Signed-off-by: Ian Rogers <irogers@...gle.com>
Acked-by: Namhyung Kim <namhyung@...nel.org>
---
v2. Rebase resolving merge conflicts, add Namhyung's Acked-by.
---
 tools/perf/util/pmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index bc1178234d3b..609828513f6c 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -2143,6 +2143,9 @@ static bool perf_pmu___name_match(const struct perf_pmu *pmu, const char *to_mat
 	for (size_t i = 0; i < ARRAY_SIZE(names); i++) {
 		const char *name = names[i];
 
+		if (!name)
+			continue;
+
 		if (wildcard && perf_pmu__match_wildcard_uncore(name, to_match))
 			return true;
 		if (!wildcard && perf_pmu__match_ignoring_suffix_uncore(name, to_match))
-- 
2.49.0.1204.g71687c7c1d-goog