From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 7F64A21F0DA47 for ; Mon, 5 Feb 2018 10:14:59 -0800 (PST) Date: Mon, 5 Feb 2018 11:20:39 -0700 From: Ross Zwisler Subject: Re: [PATCH] libnvdimm: remove redundant assignment to pointer 'dev' Message-ID: <20180205182039.GA7891@linux.intel.com> References: <20180205140852.14110-1-colin.king@canonical.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20180205140852.14110-1-colin.king@canonical.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Colin King Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org List-ID: On Mon, Feb 05, 2018 at 02:08:52PM +0000, Colin King wrote: > From: Colin Ian King > > Pointer dev is being assigned a value that is never read, it is being > re-assigned the same value later on, hence the initialization is redundant > and can be removed. > > Cleans up clang warning: > drivers/nvdimm/pfn_devs.c:307:17: warning: Value stored to 'dev' during > its initialization is never read > > Signed-off-by: Colin Ian King Reviewed-by: Ross Zwisler More importantly this fixes a potential NULL pointer dereference. nd_pfn is checked for NULL a few lines down, but we would have crashed here trying to get nd_pfn->dev. We can append the above info to the changelog when we apply. > --- > drivers/nvdimm/pfn_devs.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c > index f5c4e8c6e29d..2f4d18752c97 100644 > --- a/drivers/nvdimm/pfn_devs.c > +++ b/drivers/nvdimm/pfn_devs.c > @@ -304,7 +304,7 @@ static const struct attribute_group *nd_pfn_attribute_groups[] = { > struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn, > struct nd_namespace_common *ndns) > { > - struct device *dev = &nd_pfn->dev; > + struct device *dev; > > if (!nd_pfn) > return NULL; > -- > 2.15.1 > > _______________________________________________ > Linux-nvdimm mailing list > Linux-nvdimm@lists.01.org > https://lists.01.org/mailman/listinfo/linux-nvdimm _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm