From patchwork Thu Jun 16 09:47:41 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hannes Reinecke X-Patchwork-Id: 9180353 X-Patchwork-Delegate: christophe.varoqui@free.fr Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3C5D9608A5 for ; Thu, 16 Jun 2016 09:51:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2C97F20410 for ; Thu, 16 Jun 2016 09:51:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2151727D45; Thu, 16 Jun 2016 09:51:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from mx4-phx2.redhat.com (mx4-phx2.redhat.com [209.132.183.25]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D3C4527F07 for ; Thu, 16 Jun 2016 09:51:40 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by mx4-phx2.redhat.com (8.13.8/8.13.8) with ESMTP id u5G9mVkc024542; Thu, 16 Jun 2016 05:48:31 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id u5G9m0Pq005844 for ; Thu, 16 Jun 2016 05:48:00 -0400 Received: from mx1.redhat.com (ext-mx08.extmail.prod.ext.phx2.redhat.com [10.5.110.32]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u5G9m0hW007826 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Thu, 16 Jun 2016 05:48:00 -0400 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) (using TLSv1 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 87CE7C0842A8; Thu, 16 Jun 2016 09:47:58 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 0C8F3ADDD; Thu, 16 Jun 2016 09:47:53 +0000 (UTC) From: Hannes Reinecke To: Christophe Varoqui Date: Thu, 16 Jun 2016 11:47:41 +0200 Message-Id: <1466070465-1021-36-git-send-email-hare@suse.de> In-Reply-To: <1466070465-1021-1-git-send-email-hare@suse.de> References: <1466070465-1021-1-git-send-email-hare@suse.de> X-Greylist: Sender IP whitelisted by DNSRBL, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Thu, 16 Jun 2016 09:47:58 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Thu, 16 Jun 2016 09:47:58 +0000 (UTC) for IP:'195.135.220.15' DOMAIN:'mx2.suse.de' HELO:'mx2.suse.de' FROM:'hare@suse.de' RCPT:'' X-RedHat-Spam-Score: -3.327 (BAYES_50, DCC_REPUT_00_12, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, SPF_PASS) 195.135.220.15 mx2.suse.de 195.135.220.15 mx2.suse.de X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Scanned-By: MIMEDefang 2.78 on 10.5.110.32 X-loop: dm-devel@redhat.com Cc: Hannes Reinecke , dm-devel@redhat.com Subject: [dm-devel] [PATCH 35/39] libmultipath: mark return value from dup() as unused X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Virus-Scanned: ClamAV using ClamSMTP We are redirecting stderr, and can safely ignore any errors from dup() here. So mark the return value as unused. Found by coverity. Signed-off-by: Hannes Reinecke --- libmultipath/callout.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/libmultipath/callout.c b/libmultipath/callout.c index d671b0c..4d1b067 100644 --- a/libmultipath/callout.c +++ b/libmultipath/callout.c @@ -76,8 +76,10 @@ int execute_program(char *path, char *value, int len) /* Ignore writes to stderr */ null_fd = open("/dev/null", O_WRONLY); if (null_fd > 0) { + int err_fd __attribute__ ((unused)); + close(STDERR_FILENO); - retval = dup(null_fd); + err_fd = dup(null_fd); close(null_fd); }