linux-kernel - [PATCH 17/20] perf trace: free syscall tp fields in evsel->priv

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Message-Id: <46526611904ec5ff2768b59014e3afce8e0197d1.1626343282.git.rickyman7@gmail.com>
Date:   Thu, 15 Jul 2021 18:07:22 +0200
From:   Riccardo Mancini <rickyman7@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org,
        Riccardo Mancini <rickyman7@...il.com>
Subject: [PATCH 17/20] perf trace: free syscall tp fields in evsel->priv

ASan reports several memory leaks running the perf test
"88: Check open filename arg using perf trace + vfs_getname".
The third of these leaks is related to evsel->priv fields of sycalls never
being deallocated.

This patch adds the function evlist__free_syscall_tp_fields which
iterates over all evsels in evlist, matching syscalls, and calling the
missing frees.
This new function is called at the end of trace__run, right before
calling evlist__delete.

Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
---
 tools/perf/builtin-trace.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index d67f02d237eb0c7e..d9c65d55a9ae7526 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -3103,6 +3103,21 @@ static struct evsel *evsel__new_pgfault(u64 config)
 	return evsel;
 }
 
+static void evlist__free_syscall_tp_fields(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		struct evsel_trace *et = evsel->priv;
+
+		if (!et || !evsel->tp_format || strcmp(evsel->tp_format->system, "syscalls"))
+			continue;
+
+		free(et->fmt);
+		free(et);
+	}
+}
+
 static void trace__handle_event(struct trace *trace, union perf_event *event, struct perf_sample *sample)
 {
 	const u32 type = event->header.type;
@@ -4138,7 +4153,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 
 out_delete_evlist:
 	trace__symbols__exit(trace);
-
+	evlist__free_syscall_tp_fields(evlist);
 	evlist__delete(evlist);
 	cgroup__put(trace->cgroup);
 	trace->evlist = NULL;
-- 
2.31.1