From patchwork Mon May 16 19:36:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 573365 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 6AC90C433EF for ; Mon, 16 May 2022 19:50:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346472AbiEPTu3 (ORCPT ); Mon, 16 May 2022 15:50:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243356AbiEPTtn (ORCPT ); Mon, 16 May 2022 15:49:43 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E151433A6; Mon, 16 May 2022 12:45:07 -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 sin.source.kernel.org (Postfix) with ESMTPS id 0EBA2CE1795; Mon, 16 May 2022 19:45:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1EAC5C34100; Mon, 16 May 2022 19:45:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730303; bh=PzICwLjlQo99NgdyMEC1XtS6+gYXW+gJUuLaUJcbn10=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CLBN9ZgqeYdEJbB10Uxh/s1o5N4WvFSlrS0EvwGPKQXe/J3l32cn3bEcQe5eflsOL X3wOmmd4EjiTbkK3m8yrNx43vy75uAzkaS+svEuAqPqrfsFd67w8lneKuSe8hZG29K Y1/UtE8UdcpSyHpW2/yt0QdlUQGb7SFfk5gNtsO0= 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 5.10 21/66] s390/ctcm: fix variable dereferenced before check Date: Mon, 16 May 2022 21:36:21 +0200 Message-Id: <20220516193620.029355283@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193619.400083785@linuxfoundation.org> References: <20220516193619.400083785@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 ded1930a00b2..e3813a7aa5e6 100644 --- a/drivers/s390/net/ctcm_sysfs.c +++ b/drivers/s390/net/ctcm_sysfs.c @@ -39,11 +39,12 @@ 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)