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perf hists browser: Fix NULL deref in hists browsing code

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If there's an event with no samples in data file, the perf report
command can segfault after entering the event details menu.

Following steps reproduce the issue:

 # ./perf record -e syscalls:sys_enter_kexec_load,syscalls:sys_enter_mmap ls
 # ./perf report
 # enter '0 syscalls:sys_enter_kexec_load' menu
 # pres ENTER twice

Above steps are valid assuming ls wont run kexec.. ;)

The check for sellection to be NULL is missing. The fix makes sure it's
being check. Above steps now endup with menu being displayed allowing
'Exit' as the only option.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1333570898-10505-2-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2012-04-04 22:21:31 +02:00 committed by Arnaldo Carvalho de Melo
parent 63fa471dd4
commit 8493fe1daf
1 changed files with 3 additions and 0 deletions
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3
tools/perf/util/ui/browsers/hists.c
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@ -125,6 +125,9 @@ static int callchain__count_rows(struct rb_root *chain)
static bool map_symbol__toggle_fold(struct map_symbol *self)
{
if (!self)
return false;
if (!self->has_children)
return false;