From patchwork Mon May 16 19:36:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 573878 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7A4BAC433F5 for ; Mon, 16 May 2022 19:39:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345642AbiEPTj0 (ORCPT ); Mon, 16 May 2022 15:39:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345638AbiEPTix (ORCPT ); Mon, 16 May 2022 15:38:53 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F10C3EF3C; Mon, 16 May 2022 12:38:39 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 9C957B81607; Mon, 16 May 2022 19:38:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E800C385AA; Mon, 16 May 2022 19:38:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652729916; bh=10tgVETi0/0icrHOI5cWzODW+G7sx5Wwa+9DpVGgXQM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HmpElj9XCIRLsteH1iMptLvGHAjow00uLj3e0rVBkfjg7YdkvnnhdxCwBgyHs3hPe ahFXm4n8its7SzljdQCvrqdom60t3Ikrull4wLwuD3orubfVy0vYet9HF57TT4/LY9 0Gr7DhP0Rxh0eHe29JGDPFpPv8KNWT9EAIAQqEuk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Alexandra Winter , "David S. Miller" , Sasha Levin Subject: [PATCH 4.9 05/19] s390/ctcm: fix variable dereferenced before check Date: Mon, 16 May 2022 21:36:18 +0200 Message-Id: <20220516193613.657644555@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193613.497233635@linuxfoundation.org> References: <20220516193613.497233635@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alexandra Winter [ Upstream commit 2c50c6867c85afee6f2b3bcbc50fc9d0083d1343 ] Found by cppcheck and smatch. smatch complains about drivers/s390/net/ctcm_sysfs.c:43 ctcm_buffer_write() warn: variable dereferenced before check 'priv' (see line 42) Fixes: 3c09e2647b5e ("ctcm: rename READ/WRITE defines to avoid redefinitions") Reported-by: Colin Ian King Signed-off-by: Alexandra Winter Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/s390/net/ctcm_sysfs.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/s390/net/ctcm_sysfs.c b/drivers/s390/net/ctcm_sysfs.c index ddb0aa321339..07b7177abf26 100644 --- a/drivers/s390/net/ctcm_sysfs.c +++ b/drivers/s390/net/ctcm_sysfs.c @@ -38,11 +38,12 @@ static ssize_t ctcm_buffer_write(struct device *dev, struct ctcm_priv *priv = dev_get_drvdata(dev); int rc; - ndev = priv->channel[CTCM_READ]->netdev; - if (!(priv && priv->channel[CTCM_READ] && ndev)) { + if (!(priv && priv->channel[CTCM_READ] && + priv->channel[CTCM_READ]->netdev)) { CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, "bfnondev"); return -ENODEV; } + ndev = priv->channel[CTCM_READ]->netdev; rc = kstrtouint(buf, 0, &bs1); if (rc)