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

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Date:	Tue,  2 Jul 2013 13:27:22 -0600
From:	David Ahern <dsahern@...il.com>
To:	acme@...stprotocols.net, linux-kernel@...r.kernel.org
Cc:	David Ahern <dsahern@...il.com>, Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH 3/6] perf event: initialize allocated memory for synthesized events

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@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.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

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