From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754997AbbLKOZV (ORCPT ); Fri, 11 Dec 2015 09:25:21 -0500 Received: from bombadil.infradead.org ([198.137.202.9]:51160 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754135AbbLKOXP (ORCPT ); Fri, 11 Dec 2015 09:23:15 -0500 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Wang Nan , Jiri Olsa , Namhyung Kim , Zefan Li , pi3orama@163.com, Arnaldo Carvalho de Melo Subject: [PATCH 9/9] perf tools: Clear struct machine during machine__init() Date: Fri, 11 Dec 2015 11:22:32 -0300 Message-Id: <1449843752-28395-10-git-send-email-acme@kernel.org> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1449843752-28395-1-git-send-email-acme@kernel.org> References: <1449843752-28395-1-git-send-email-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wang Nan There are so many test cases use stack allocated 'struct machine'. Including: test__hists_link test__hists_filter test__mmap_thread_lookup test__thread_mg_share test__hists_output test__hists_cumulate Also, in non-test code (for example, machine__new_host()) there are code use 'malloc()' to alloc struct machine. These are dangerous operations, cause some tests fail or hung in machines__exit(). For example, in machines__exit -> machine__destroy_kernel_maps -> map_groups__remove -> maps__remove -> pthread_rwlock_wrlock a incorrectly initialized lock causes unintended behavior. This patch memset(0) that structure in machine__init() to ensure all fields in 'struct machine' are initialized to zero. Signed-off-by: Wang Nan Cc: Jiri Olsa Cc: Namhyung Kim Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1449541544-67621-17-git-send-email-wangnan0@huawei.com [ Use memset, see 'man bzero' ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/machine.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index f5882b8c8db9..1407d5107480 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -25,6 +25,7 @@ static void dsos__init(struct dsos *dsos) int machine__init(struct machine *machine, const char *root_dir, pid_t pid) { + memset(machine, 0, sizeof(*machine)); map_groups__init(&machine->kmaps, machine); RB_CLEAR_NODE(&machine->rb_node); dsos__init(&machine->dsos); -- 2.1.0