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[142.68.57.212]) by smtp.gmail.com with ESMTPSA id o81sm5958528qke.24.2020.03.28.05.40.03 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 28 Mar 2020 05:40:03 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1jIAks-0006TL-S7; Sat, 28 Mar 2020 09:40:02 -0300 Date: Sat, 28 Mar 2020 09:40:02 -0300 From: Jason Gunthorpe To: liweihang Cc: "Gustavo A. R. Silva" , oulijun , "Huwei (Xavier)" , Doug Ledford , "wangxi (M)" , "linux-rdma@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH][next] RDMA/hns: Fix uninitialized variable bug Message-ID: <20200328124002.GB20941@ziepe.ca> References: <20200327193142.GA32547@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Mar 28, 2020 at 02:15:14AM +0000, liweihang wrote: > On 2020/3/28 3:28, Gustavo A. R. Silva wrote: > > There is a potential execution path in which variable *ret* is returned > > without being properly initialized, previously. > > > > Fix this by initializing variable *ret* to -ENODEV. > > > > Addresses-Coverity-ID: 1491917 ("Uninitialized scalar variable") > > Fixes: 2f49de21f3e9 ("RDMA/hns: Optimize mhop get flow for multi-hop addressing") > > Signed-off-by: Gustavo A. R. Silva > > drivers/infiniband/hw/hns/hns_roce_hem.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.c b/drivers/infiniband/hw/hns/hns_roce_hem.c > > index c96378718f88..3fd8100c2b56 100644 > > +++ b/drivers/infiniband/hw/hns/hns_roce_hem.c > > @@ -603,7 +603,7 @@ static int set_mhop_hem(struct hns_roce_dev *hr_dev, > > { > > struct ib_device *ibdev = &hr_dev->ib_dev; > > int step_idx; > > - int ret; > > + int ret = -ENODEV; > > > > if (index->inited & HEM_INDEX_L0) { > > ret = hr_dev->hw->set_hem(hr_dev, table, obj, 0); > > > > Hi Gustavo, > > Thanks for your modification. But I check the code and I think "ret" > should be initialized to 0, which means no need to set hem and it is > not an error. Weihang, thank you for checking, I would have taken it without your remarks :) Jason