linux-kernel - [PATCH 06/16] perf: fix memory leak in print_sdt

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Date:   Sat, 16 Mar 2019 16:05:46 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     namhyung@...nel.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>, rostedt@...dmis.org,
        Daniel Borkmann <daniel@...earbox.net>, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Changbin Du <changbin.du@...il.com>
Subject: [PATCH 06/16] perf: fix memory leak in print_sdt_events()

Direct leak of 4356 byte(s) in 120 object(s) allocated from:
    #0 0x7ff1a2b5a070 in __interceptor_strdup (/usr/lib/x86_64-linux-gnu/libasan.so.5+0x3b070)
    #1 0x55719aef4814 in build_id_cache__origname util/build-id.c:215
    #2 0x55719af649b6 in print_sdt_events util/parse-events.c:2339
    #3 0x55719af66272 in print_events util/parse-events.c:2542
    #4 0x55719ad1ecaa in cmd_list /home/changbin/work/linux/tools/perf/builtin-list.c:58
    #5 0x55719aec745d in run_builtin /home/changbin/work/linux/tools/perf/perf.c:302
    #6 0x55719aec7d1a in handle_internal_command /home/changbin/work/linux/tools/perf/perf.c:354
    #7 0x55719aec8184 in run_argv /home/changbin/work/linux/tools/perf/perf.c:398
    #8 0x55719aeca41a in main /home/changbin/work/linux/tools/perf/perf.c:520
    #9 0x7ff1a07ae09a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)

Signed-off-by: Changbin Du <changbin.du@...il.com>
---
 tools/perf/util/build-id.c     | 1 +
 tools/perf/util/parse-events.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index bff0d17920ed..0c5517a8d0b7 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -185,6 +185,7 @@ char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
 	return bf;
 }
 
+/* The caller is responsible to free the returned buffer. */
 char *build_id_cache__origname(const char *sbuild_id)
 {
 	char *linkname;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 2e9035c4c252..5ef4939408f2 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -2342,6 +2342,7 @@ void print_sdt_events(const char *subsys_glob, const char *event_glob,
 				printf("  %-50s [%s]\n", buf, "SDT event");
 				free(buf);
 			}
+			free(path);
 		} else
 			printf("  %-50s [%s]\n", nd->s, "SDT event");
 		if (nd2) {
-- 
2.19.1