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* [PATCH] perf header: Fix memory leaks
@ 2021-11-18 20:17 Ian Rogers
  2021-11-28 15:46 ` Jiri Olsa
  0 siblings, 1 reply; 5+ messages in thread
From: Ian Rogers @ 2021-11-18 20:17 UTC (permalink / raw)
  To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
	Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
	linux-perf-users, linux-kernel
  Cc: Stephane Eranian, Ian Rogers

These leaks were found with leak sanitizer running "perf pipe recording
and injection test". In pipe mode feat_fd may hold onto an events struct
that needs freeing. When string features are processed they may
overwrite an already created string, so free this before the overwrite.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/header.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 79cce216727e..e3c1a532d059 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2321,6 +2321,7 @@ static int perf_header__read_build_ids(struct perf_header *header,
 #define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
 static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
 {\
+	free(ff->ph->env.__feat_env);		     \
 	ff->ph->env.__feat_env = do_read_string(ff); \
 	return ff->ph->env.__feat_env ? 0 : -ENOMEM; \
 }
@@ -4124,6 +4125,7 @@ int perf_event__process_feature(struct perf_session *session,
 	struct perf_record_header_feature *fe = (struct perf_record_header_feature *)event;
 	int type = fe->header.type;
 	u64 feat = fe->feat_id;
+	int ret = 0;
 
 	if (type < 0 || type >= PERF_RECORD_HEADER_MAX) {
 		pr_warning("invalid record type %d in pipe-mode\n", type);
@@ -4141,11 +4143,13 @@ int perf_event__process_feature(struct perf_session *session,
 	ff.size = event->header.size - sizeof(*fe);
 	ff.ph = &session->header;
 
-	if (feat_ops[feat].process(&ff, NULL))
-		return -1;
+	if (feat_ops[feat].process(&ff, NULL)) {
+		ret = -1;
+		goto out;
+	}
 
 	if (!feat_ops[feat].print || !tool->show_feat_hdr)
-		return 0;
+		goto out;
 
 	if (!feat_ops[feat].full_only ||
 	    tool->show_feat_hdr >= SHOW_FEAT_HEADER_FULL_INFO) {
@@ -4154,8 +4158,9 @@ int perf_event__process_feature(struct perf_session *session,
 		fprintf(stdout, "# %s info available, use -I to display\n",
 			feat_ops[feat].name);
 	}
-
-	return 0;
+out:
+	free_event_desc(ff.events);
+	return ret;
 }
 
 size_t perf_event__fprintf_event_update(union perf_event *event, FILE *fp)
-- 
2.34.0.rc2.393.gf8c9666880-goog


^ permalink raw reply related	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2021-11-30 19:22 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2021-11-18 20:17 [PATCH] perf header: Fix memory leaks Ian Rogers
2021-11-28 15:46 ` Jiri Olsa
2021-11-29 23:38   ` Ian Rogers
2021-11-30 18:15     ` Jiri Olsa
2021-11-30 19:22       ` Arnaldo Carvalho de Melo

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