perf top: Fix segfault pressing -> with no hist entries

'perf top' segfaults with following operation:

 # perf top -e page-faults -p 11400 # 11400 never generates page-fault

Then on the resulting empty interface, press right key:

  # ./perf top -e page-faults -p 11400
  perf: Segmentation fault
  -------- backtrace --------
  ./perf[0x535428]
  /lib64/libc.so.6(+0x3545f)[0x7f0dd360745f]
  ./perf[0x531d46]
  ./perf(perf_evlist__tui_browse_hists+0x96)[0x5340d6]
  ./perf[0x44ba2f]
  /lib64/libpthread.so.0(+0x81d0)[0x7f0dd49dc1d0]
  /lib64/libc.so.6(clone+0x6c)[0x7f0dd36b90dc]

The bug resides in perf_evsel__hists_browse() that, in the above
circumstance browser->selection can be NULL, but code after
skip_annotation doesn't consider it.

This patch fix it by checking browser->selection before fetching
browser->selection->map.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1442226235-117265-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index cf86f2d3a5e7..c04c60d4863c 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -1968,7 +1968,8 @@ skip_annotation:
                                           &options[nr_options], dso);
                 nr_options += add_map_opt(browser, &actions[nr_options],
                                           &options[nr_options],
-                                          browser->selection->map);
+                                          browser->selection ?
+                                                browser->selection->map : NULL);
 
                 /* perf script support */
                 if (browser->he_selection) {
@@ -1976,6 +1977,15 @@ skip_annotation:
                                                      &actions[nr_options],
                                                      &options[nr_options],
                                                      thread, NULL);
+                        /*
+                         * Note that browser->selection != NULL
+                         * when browser->he_selection is not NULL,
+                         * so we don't need to check browser->selection
+                         * before fetching browser->selection->sym like what
+                         * we do before fetching browser->selection->map.
+                         *
+                         * See hist_browser__show_entry.
+                         */
                         nr_options += add_script_opt(browser,
                                                      &actions[nr_options],
                                                      &options[nr_options],