perf script: Fix a NULL pointer dereference

If 'perf script --gen-script' was called with a perf.data which contains
no tracepoint event, it'd segfault due to NULL pevent pointer. Fix it.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Feng Tang <feng.tang@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1344909423-26384-1-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 4cb7f3831f7893fe238f4c250c93ed304caf6cf7..a5a554efeb503cd8e0d97ad6f5919043d8efdadb 100644 (file)
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -293,7 +293,7 @@ struct event_format *trace_find_next_event(struct pevent *pevent,
 {
        static int idx;
 
-       if (!pevent->events)
+       if (!pevent || !pevent->events)
                return NULL;
 
        if (!event) {