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Bug#943398: linux-perf-5.2: perf report segmentation fault

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Dear Maintainer,
I could reproduce using linux-perf-5.2 and it is
also visible in linux-perf-5.4 5.4.8-1,
by just pressing enter.

The crash happens because in line 3172
function hist_browser__selected_entry returns
browser->he_selection, which is at this time a
null pointer.
This null pointer gets dereferenced to
access the res_samples member.

Upstream seems to have fixed other occourences [1]
of browser->he_selection being null, but this is
already contained in 5.4 while a crash still happens.

Kind regards,
Bernhard



Program received signal SIGSEGV, Segmentation fault.
(rr) bt
#0  perf_evsel__hists_browse (evsel=0x55e794ebcb40, nr_events=nr_events@entry=1, helpline=helpline@entry=0x55e794f7c040 "Tip: System-wide collection from all CPUs: perf record -a", left_exits=left_exits@entry=false, hbt=hbt@entry=0x0, min_pcnt=<optimized out>, env=env@entry=0x55e794eb54f0, warn_lost_event=true, annotation_opts=0x7ffcc3063dc8) at ui/browsers/hists.c:3170
#1  0x000055e79385cce9 in perf_evlist__tui_browse_hists (evlist=evlist@entry=0x55e794ebc0c0, help=help@entry=0x55e794f7c040 "Tip: System-wide collection from all CPUs: perf record -a", hbt=hbt@entry=0x0, min_pcnt=<optimized out>, env=env@entry=0x55e794eb54f0, warn_lost_event=warn_lost_event@entry=true, annotation_opts=annotation_opts@entry=0x7ffcc3063dc8) at ui/browsers/hists.c:3422
#2  0x000055e7936f1ece in report__browse_hists (rep=0x7ffcc3063c30) at builtin-report.c:585
#3  __cmd_report (rep=0x7ffcc3063c30) at builtin-report.c:930
#4  cmd_report (argc=<optimized out>, argv=<optimized out>) at builtin-report.c:1475
#5  0x000055e79375b823 in run_builtin (p=0x55e793a9ef90 <commands+240>, argc=2, argv=0x7ffcc30661f0) at perf.c:312
#6  0x000055e7936d6a2c in handle_internal_command (argv=<optimized out>, argc=<optimized out>) at perf.c:364
#7  run_argv (argcp=<optimized out>, argv=<optimized out>) at perf.c:408
#8  main (argc=2, argv=0x7ffcc30661f0) at perf.c:538


https://sources.debian.org/src/linux/5.4.8-1/tools/perf/ui/browsers/hists.c/#L2217
    2217 static struct hist_entry *hist_browser__selected_entry(struct hist_browser *browser)
    2218 {
    2219 	return browser->he_selection;
    2220 }

https://sources.debian.org/src/linux/5.4.8-1/tools/perf/ui/browsers/hists.c/#L3170
    3170 		nr_options += add_res_sample_opt(browser, &actions[nr_options],
    3171 						 &options[nr_options],
    3172 				 hist_browser__selected_entry(browser)->res_samples,
    3173 				 evsel, A_NORMAL);


[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/tools/perf/ui/browsers/hists.c?id=ceb75476db1617a88cc29b09839acacb69aa076e

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Bug#943398: linux-perf-5.2: perf report segmentation fault Bernhard Übelacker <bernhardu@mailbox.org> - 2020-01-14 01:10 +0100
  Bug#943398: linux-perf-5.2: perf report segmentation fault Salvatore Bonaccorso <carnil@debian.org> - 2020-01-15 21:20 +0100
    Bug#943398: linux-perf-5.2: perf report segmentation fault Bernhard Übelacker <bernhardu@mailbox.org> - 2020-01-20 22:50 +0100
      Bug#943398: linux-perf-5.2: perf report segmentation fault Salvatore Bonaccorso <carnil@debian.org> - 2020-01-21 17:40 +0100
        Bug#943398: linux-perf-5.2: perf report segmentation fault Bernhard Übelacker <bernhardu@mailbox.org> - 2020-01-23 11:10 +0100

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