perf hists: Fix crash in perf_hpp__reset_output_field()
authorJiri Olsa <jolsa@kernel.org>
Fri, 13 Oct 2017 08:37:28 +0000 (10:37 +0200)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Fri, 13 Oct 2017 19:43:33 +0000 (16:43 -0300)
commit70b01dfd765dd2196d51f33a49df23954416f34a
treed1ff4eb32d8ca165b896ed823a952d586ded10da
parent47a74bdcbfeff543f706dc0e385eebbb5d655ed2
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@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