From patchwork Fri Feb 26 09:32:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 63006 Delivered-To: patch@linaro.org Received: by 10.112.199.169 with SMTP id jl9csp613130lbc; Fri, 26 Feb 2016 01:41:35 -0800 (PST) X-Received: by 10.98.72.215 with SMTP id q84mr727876pfi.152.1456479695702; Fri, 26 Feb 2016 01:41:35 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id tl2si18779607pac.218.2016.02.26.01.41.35; Fri, 26 Feb 2016 01:41:35 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752966AbcBZJeA (ORCPT + 30 others); Fri, 26 Feb 2016 04:34:00 -0500 Received: from szxga03-in.huawei.com ([119.145.14.66]:8959 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752576AbcBZJds (ORCPT ); Fri, 26 Feb 2016 04:33:48 -0500 Received: from 172.24.1.47 (EHLO szxeml422-hub.china.huawei.com) ([172.24.1.47]) by szxrg03-dlp.huawei.com (MOS 4.4.3-GA FastPath queued) with ESMTP id BWR34435; Fri, 26 Feb 2016 17:33:13 +0800 (CST) Received: from linux-4hy3.site (10.107.193.248) by szxeml422-hub.china.huawei.com (10.82.67.152) with Microsoft SMTP Server id 14.3.235.1; Fri, 26 Feb 2016 17:33:04 +0800 From: Wang Nan To: Alexei Starovoitov , Arnaldo Carvalho de Melo , Arnaldo Carvalho de Melo CC: Jiri Olsa , Li Zefan , "Peter Zijlstra" , , Wang Nan , , He Kuang , Masami Hiramatsu , Namhyung Kim Subject: [PATCH 29/46] perf record: Ensure return non-zero rc when mmap fail Date: Fri, 26 Feb 2016 09:32:17 +0000 Message-ID: <1456479154-136027-30-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1456479154-136027-1-git-send-email-wangnan0@huawei.com> References: <1456479154-136027-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.193.248] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090205.56D01BF6.0026, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 23a98a8d131d7468bc06198aee064675 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org perf_evlist__mmap_ex() can fail without setting errno (for example, fail in condition checking. In this case all syscall is success). If this happen, record__open() incorrectly returns 0. Force setting rc is a quick way to avoid this problem, or we have to follow all possible code path in perf_evlist__mmap_ex() to make sure there's at least one system call before returning an error. Signed-off-by: Wang Nan Signed-off-by: He Kuang Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Masami Hiramatsu Cc: Namhyung Kim Cc: Zefan Li Cc: pi3orama@163.com --- tools/perf/builtin-record.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) -- 1.8.3.4 diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index a2de15b..fa16099 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -363,7 +363,10 @@ try_again: } else { pr_err("failed to mmap with %d (%s)\n", errno, strerror_r(errno, msg, sizeof(msg))); - rc = -errno; + if (errno) + rc = -errno; + else + rc = -EINVAL; } goto out; }