From: Namhyung Kim Date: Wed, 18 Jan 2017 05:14:56 +0000 (+0900) Subject: perf diff: Fix segfault on 'perf diff -o N' option X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=de65c300c7f0d1e18f5a92ea7a6c1cc9a0734202;p=linux-beck.git perf diff: Fix segfault on 'perf diff -o N' option commit 8381cdd0e32dd748bd34ca3ace476949948bd793 upstream. The -o/--order option is to select column number to sort a diff result. It does the job by adding a hpp field at the beginning of the sort list. But it should not be added to the output field list as it has no callbacks required by a output field. During the setup_sorting(), the perf_hpp__setup_output_field() appends the given sort keys to the output field if it's not there already. Originally it was checked by fmt->list being non-empty. But commit 3f931f2c4274 ("perf hists: Make hpp setup function generic") changed it to check the ->equal callback. Anyways, we don't need to add the pseudo hpp field to the output field list since it won't be used for output. So just skip fields if they have no ->color or ->entry callbacks. Signed-off-by: Namhyung Kim Acked-by: Jiri Olsa Cc: Peter Zijlstra Fixes: 3f931f2c4274 ("perf hists: Make hpp setup function generic") Link: http://lkml.kernel.org/r/20170118051457.30946-1-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Greg Kroah-Hartman --- diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c index 2cfedef04e13..18cfcdc90356 100644 --- a/tools/perf/ui/hist.c +++ b/tools/perf/ui/hist.c @@ -566,6 +566,10 @@ void perf_hpp__setup_output_field(struct perf_hpp_list *list) perf_hpp_list__for_each_sort_list(list, fmt) { struct perf_hpp_fmt *pos; + /* skip sort-only fields ("sort_compute" in perf diff) */ + if (!fmt->entry && !fmt->color) + continue; + perf_hpp_list__for_each_format(list, pos) { if (fmt_equal(fmt, pos)) goto next;