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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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        Namhyung Kim <namhyung@kernel.org>,
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        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 5.16 1002/1039] perf metricgroup: Fix use after free in metric__new()
Date:   Mon, 24 Jan 2022 19:46:31 +0100
Message-Id: <20220124184158.967660423@linuxfoundation.org>
In-Reply-To: <20220124184125.121143506@linuxfoundation.org>
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From: José Expósito <jose.exposito89@gmail.com>

commit e000ea0beffb5497425054b151369fe37a792ece upstream.

We shouldn't free() something that will be used in the next line, fix
it.

Fixes: b85a4d61d3022608 ("perf metric: Allow modifiers on metrics")
Addresses-Coverity-ID: 1494000
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20211208171113.22089-1-jose.exposito89@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 tools/perf/util/metricgroup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -209,8 +209,8 @@ static struct metric *metric__new(const
 	m->metric_name = pe->metric_name;
 	m->modifier = modifier ? strdup(modifier) : NULL;
 	if (modifier && !m->modifier) {
-		free(m);
 		expr__ctx_free(m->pctx);
+		free(m);
 		return NULL;
 	}
 	m->metric_expr = pe->metric_expr;