linux-kernel - [tip:perf/urgent] perf session: Fix double free in perf_data_

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Message-ID: <tip-befa09b61f8bf1d7c34b8e6405f08d804640573c@git.kernel.org>
Date:   Sat, 9 Mar 2019 12:09:11 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     nasastry@...ibm.com, acme@...hat.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org, ravi.bangoria@...ux.ibm.com,
        namhyung@...nel.org, hpa@...or.com, ak@...ux.intel.com,
        jonas.rabenstein@...dium.uni-erlangen.de, jolsa@...nel.org,
        alexander.shishkin@...ux.intel.com, peterz@...radead.org,
        tglx@...utronix.de
Subject: [tip:perf/urgent] perf session: Fix double free in perf_data__close

Commit-ID:  befa09b61f8bf1d7c34b8e6405f08d804640573c
Gitweb:     https://git.kernel.org/tip/befa09b61f8bf1d7c34b8e6405f08d804640573c
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Tue, 5 Mar 2019 16:25:35 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 6 Mar 2019 18:20:33 -0300

perf session: Fix double free in perf_data__close

We can't call perf_data__close and subsequently perf_session__delete,
because it will call perf_data__close again and cause double free for
data->file.path.

  $ perf report -i .
  incompatible file format (rerun with -v to learn more)
  free(): double free detected in tcache 2
  Aborted (core dumped)

In fact we don't need to call perf_data__close at all, because at the
time the got out_close is reached, session->data is already initialized,
so the perf_data__close call will be triggered from
perf_session__delete.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Jonas Rabenstein <jonas.rabenstein@...dium.uni-erlangen.de>
Cc: Nageswara R Sastry <nasastry@...ibm.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Fixes: 2d4f27999b88 ("perf data: Add global path holder")
Link: http://lkml.kernel.org/r/20190305152536.21035-8-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/session.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index c764bbc91009..db643f3c2b95 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -140,7 +140,7 @@ struct perf_session *perf_session__new(struct perf_data *data,
 
 		if (perf_data__is_read(data)) {
 			if (perf_session__open(session) < 0)
-				goto out_close;
+				goto out_delete;
 
 			/*
 			 * set session attributes that are present in perf.data
@@ -181,8 +181,6 @@ struct perf_session *perf_session__new(struct perf_data *data,
 
 	return session;
 
- out_close:
-	perf_data__close(data);
  out_delete:
 	perf_session__delete(session);
  out: