linux-kernel - [PATCH 5.12 114/178] perf metricgroup: Return error code from metricgroup__add_metric_sys_event

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Message-Id: <20210621154926.650552769@linuxfoundation.org>
Date:   Mon, 21 Jun 2021 18:15:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, John Garry <john.garry@...wei.com>,
        Ian Rogers <irogers@...gle.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>, Kajol Jain <kjain@...ux.ibm.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 114/178] perf metricgroup: Return error code from metricgroup__add_metric_sys_event_iter()

From: John Garry <john.garry@...wei.com>

[ Upstream commit fe7a98b9d9b36e5c8a22d76b67d29721f153f66e ]

The error code is not set at all in the sys event iter function.

This may lead to an uninitialized value of "ret" in
metricgroup__add_metric() when no CPU metric is added.

Fix by properly setting the error code.

It is not necessary to init "ret" to 0 in metricgroup__add_metric(), as
if we have no CPU or sys event metric matching, then "has_match" should
be 0 and "ret" is set to -EINVAL.

However gcc cannot detect that it may not have been set after the
map_for_each_metric() loop for CPU metrics, which is strange.

Fixes: be335ec28efa8 ("perf metricgroup: Support adding metrics for system PMUs")
Signed-off-by: John Garry <john.garry@...wei.com>
Acked-by: Ian Rogers <irogers@...gle.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Kajol Jain <kjain@...ux.ibm.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lore.kernel.org/lkml/1623335580-187317-3-git-send-email-john.garry@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/util/metricgroup.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 1af71ac1cc68..939aed36e0c2 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1072,16 +1072,18 @@ static int metricgroup__add_metric_sys_event_iter(struct pmu_event *pe,
 
 	ret = add_metric(d->metric_list, pe, d->metric_no_group, &m, NULL, d->ids);
 	if (ret)
-		return ret;
+		goto out;
 
 	ret = resolve_metric(d->metric_no_group,
 				     d->metric_list, NULL, d->ids);
 	if (ret)
-		return ret;
+		goto out;
 
 	*(d->has_match) = true;
 
-	return *d->ret;
+out:
+	*(d->ret) = ret;
+	return ret;
 }
 
 static int metricgroup__add_metric(const char *metric, bool metric_no_group,
-- 
2.30.2