linux-kernel - [tip:perf/urgent] perf hists: Fix crash in perf_hpp__reset_output

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Date:   Fri, 20 Oct 2017 00:18:39 -0700
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     namhyung@...nel.org, linux-kernel@...r.kernel.org,
        dsahern@...il.com, wangnan0@...wei.com, jolsa@...nel.org,
        acme@...hat.com, tglx@...utronix.de, andi@...stfloor.org,
        peterz@...radead.org, yao.jin@...ux.intel.com, hpa@...or.com,
        changbin.du@...el.com, mingo@...nel.org
Subject: [tip:perf/urgent] perf hists: Fix crash in
 perf_hpp__reset_output_field()

Commit-ID:  70b01dfd765dd2196d51f33a49df23954416f34a
Gitweb:     https://git.kernel.org/tip/70b01dfd765dd2196d51f33a49df23954416f34a
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Fri, 13 Oct 2017 10:37:28 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 13 Oct 2017 16:43:33 -0300

perf hists: Fix crash in perf_hpp__reset_output_field()

Du Changbin reported crash [1] when calling perf_hpp__reset_output_field()
after unregistering field via perf_hpp__column_unregister().

This ends up in calling following list_del* sequence on
the same format:

  perf_hpp__column_unregister:
    list_del(&format->list);
  perf_hpp__reset_output_field:
    list_del_init(&fmt->list);

where the later list_del_init might touch already freed formats.

Fixing this by replacing list_del() with list_del_init() in
perf_hpp__column_unregister().

[1] http://marc.info/?l=linux-kernel&m=149059595826019&w=2

Reported-by: Changbin Du <changbin.du@...el.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/20171013083736.15037-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/ui/hist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index ddb2c6f..6ee6b36 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -532,7 +532,7 @@ void perf_hpp_list__prepend_sort_field(struct perf_hpp_list *list,
 
 void perf_hpp__column_unregister(struct perf_hpp_fmt *format)
 {
-	list_del(&format->list);
+	list_del_init(&format->list);
 }
 
 void perf_hpp__cancel_cumulate(void)