linux-kernel - [PATCH] perf: pmu: Fix IS_ERR() vs NULL check bug in perf_pmu_

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Message-Id: <20250805063209.3678359-1-linmq006@gmail.com>
Date: Tue,  5 Aug 2025 10:32:07 +0400
From: Miaoqian Lin <linmq006@...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>,
	James Clark <james.clark@...aro.org>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: linmq006@...il.com
Subject: [PATCH] perf: pmu: Fix IS_ERR() vs NULL check bug in perf_pmu__init

Replace NULL check with IS_ERR() check after calling
hashmap__new() since this function return error pointers (ERR_PTR).
Using NULL check could lead to invalid pointer dereference.

Fixes: 754baf426e09 ("perf pmu: Change aliases from list to hashmap")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 tools/perf/util/pmu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 5a291f1380ed..da6f05872493 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1176,7 +1176,7 @@ int perf_pmu__init(struct perf_pmu *pmu, __u32 type, const char *name)
 		return -ENOMEM;
 
 	pmu->aliases = hashmap__new(aliases__hash, aliases__equal, /*ctx=*/ NULL);
-	if (!pmu->aliases)
+	if (IS_ERR(pmu->aliases))
 		return -ENOMEM;
 
 	return 0;
-- 
2.25.1