linux-kernel - [tip:perf/urgent] perf ordered_events: Fix crash in ordered_events_

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 22 Jan 2019 03:33:58 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, mingo@...nel.org, peterz@...radead.org,
        eranian@...gle.com, jolsa@...nel.org, namhyung@...nel.org,
        alexander.shishkin@...ux.intel.com, linux-kernel@...r.kernel.org,
        acme@...hat.com, tglx@...utronix.de, liu.song.a23@...il.com
Subject: [tip:perf/urgent] perf ordered_events: Fix crash in
 ordered_events__free

Commit-ID:  99d86c8b88393e29cf07c020585f2c8afbcdd97d
Gitweb:     https://git.kernel.org/tip/99d86c8b88393e29cf07c020585f2c8afbcdd97d
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Thu, 17 Jan 2019 12:30:17 +0100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 17 Jan 2019 11:07:00 -0300

perf ordered_events: Fix crash in ordered_events__free

Song Liu reported crash in 'perf record':

  > #0  0x0000000000500055 in ordered_events(float, long double,...)(...) ()
  > #1  0x0000000000500196 in ordered_events.reinit ()
  > #2  0x00000000004fe413 in perf_session.process_events ()
  > #3  0x0000000000440431 in cmd_record ()
  > #4  0x00000000004a439f in run_builtin ()
  > #5  0x000000000042b3e5 in main ()"

This can happen when we get out of buffers during event processing.

The subsequent ordered_events__free() call assumes oe->buffer != NULL
and crashes. Add a check to prevent that.

Reported-by: Song Liu <liu.song.a23@...il.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Reviewed-by: Song Liu <liu.song.a23@...il.com>
Tested-by: Song Liu <liu.song.a23@...il.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/20190117113017.12977-1-jolsa@kernel.org
Fixes: d5ceb62b3654 ("perf ordered_events: Add 'struct ordered_events_buffer' layer")
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/ordered-events.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/ordered-events.c b/tools/perf/util/ordered-events.c
index 897589507d97..ea523d3b248f 100644
--- a/tools/perf/util/ordered-events.c
+++ b/tools/perf/util/ordered-events.c
@@ -391,8 +391,10 @@ void ordered_events__free(struct ordered_events *oe)
 	 * Current buffer might not have all the events allocated
 	 * yet, we need to free only allocated ones ...
 	 */
-	list_del(&oe->buffer->list);
-	ordered_events_buffer__free(oe->buffer, oe->buffer_idx, oe);
+	if (oe->buffer) {
+		list_del(&oe->buffer->list);
+		ordered_events_buffer__free(oe->buffer, oe->buffer_idx, oe);
+	}
 
 	/* ... and continue with the rest */
 	list_for_each_entry_safe(buffer, tmp, &oe->to_free, list) {