[PATCH 3/6] perf event: initialize allocated memory for synthesized events

[David Ahern <dsahern@gmail.com>]

Fixes valgrind complaint:

=3118== Syscall param write(buf) points to uninitialised byte(s)
==3118==    at 0x4E3F5B0: __write_nocancel (in /lib64/libpthread-2.14.90.so)
==3118==    by 0x42F0EB: process_synthesized_event (builtin-record.c:89)
==3118==    by 0x44E81C: perf_event__synthesize_mmap_events (event.c:230)
==3118==    by 0x44F27C: perf_event__synthesize_threads (event.c:307)
==3118==    by 0x42FEEA: cmd_record (builtin-record.c:530)
==3118==    by 0x419D22: run_builtin (perf.c:319)
==3118==    by 0x4195A2: main (perf.c:376)

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/event.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 5cd13d7..556b999 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -316,11 +316,11 @@ int perf_event__synthesize_thread_map(struct perf_tool *tool,
 	union perf_event *comm_event, *mmap_event;
 	int err = -1, thread, j;
 
-	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
+	comm_event = zalloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 	if (comm_event == NULL)
 		goto out;
 
-	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
+	mmap_event = zalloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 	if (mmap_event == NULL)
 		goto out_free_comm;
 
@@ -375,11 +375,11 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
 	union perf_event *comm_event, *mmap_event;
 	int err = -1;
 
-	comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
+	comm_event = zalloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 	if (comm_event == NULL)
 		goto out;
 
-	mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
+	mmap_event = zalloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 	if (mmap_event == NULL)
 		goto out_free_comm;
 
-- 
1.7.10.1