From patchwork Mon Jan 11 13:48:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 59504 Delivered-To: patch@linaro.org Received: by 10.112.130.2 with SMTP id oa2csp2122078lbb; Mon, 11 Jan 2016 05:52:09 -0800 (PST) X-Received: by 10.66.234.226 with SMTP id uh2mr15180986pac.20.1452520329006; Mon, 11 Jan 2016 05:52:09 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f65si28686734pff.29.2016.01.11.05.52.08; Mon, 11 Jan 2016 05:52:08 -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 S1760238AbcAKNus (ORCPT + 29 others); Mon, 11 Jan 2016 08:50:48 -0500 Received: from szxga02-in.huawei.com ([119.145.14.65]:11613 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759273AbcAKNt7 (ORCPT ); Mon, 11 Jan 2016 08:49:59 -0500 Received: from 172.24.1.47 (EHLO szxeml422-hub.china.huawei.com) ([172.24.1.47]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CZQ72429; Mon, 11 Jan 2016 21:49:32 +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; Mon, 11 Jan 2016 21:49:23 +0800 From: Wang Nan To: CC: , , , , , Wang Nan , He Kuang , "Arnaldo Carvalho de Melo" , Jiri Olsa , Masami Hiramatsu , Namhyung Kim Subject: [PATCH 41/53] perf record: Ensure return non-zero rc when mmap fail Date: Mon, 11 Jan 2016 13:48:32 +0000 Message-ID: <1452520124-2073-42-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.3.4 In-Reply-To: <1452520124-2073-1-git-send-email-wangnan0@huawei.com> References: <1452520124-2073-1-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=0001.0A020204.5693B2ED.004E, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: a496aab4dee22320f3ba9d69edbf3d99 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 aaf3b0f..b65b41f 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -361,7 +361,10 @@ 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; }