lkml.org 
[lkml]   [2017]   [Oct]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/8] perf hists: Fix crash in perf_hpp__reset_output_field()
Date
From: Jiri Olsa <jolsa@kernel.org>

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@intel.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/20171013083736.15037-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 ddb2c6fbdf91..6ee6b36bbc76 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)
--
2.13.6
\
 
 \ /
  Last update: 2017-10-22 17:29    [W:0.461 / U:0.456 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site