perf trace: Check if sample raw_data field is set

Sometimes we're segfaulting because we were expecting that the
perf_sample.raw_data field was set as requested, but in some cases
that needs further investigation, that field can be NULL, leading
to segfaults.

Make the tool more robust by checking that before calling any per event
handlers that may try to use that field.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-g1fmodl6ys4lq8honbj1igoi@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 83c6515e425de5c22c7d7e6114492d9cc8ddb4e7..7aaee39f6774f1fc49131dd7a3d67f002bee823c 100644 (file)
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -268,6 +268,13 @@ again:
                        if (evlist->threads->map[0] == -1 || evlist->threads->nr > 1)
                                printf("%d ", sample.tid);
 
+                       if (sample.raw_data == NULL) {
+                               printf("%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
+                                      perf_evsel__name(evsel), sample.tid,
+                                      sample.cpu, sample.raw_size);
+                               continue;
+                       }
+
                        handler = evsel->handler.func;
                        handler(trace, evsel, &sample);
                }