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[142.68.57.212]) by smtp.gmail.com with ESMTPSA id y9sm4297975qkb.41.2020.04.24.11.30.57 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 24 Apr 2020 11:30:57 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1jS36G-0004fV-TI; Fri, 24 Apr 2020 15:30:56 -0300 Date: Fri, 24 Apr 2020 15:30:56 -0300 From: Jason Gunthorpe To: Sudip Mukherjee Cc: Zhu Yanjun , Doug Ledford , linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org Subject: Re: [PATCH] RDMA/rxe: check for error Message-ID: <20200424183056.GA17877@ziepe.ca> References: <20200423104813.20484-1-sudipm.mukherjee@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200423104813.20484-1-sudipm.mukherjee@gmail.com> 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 Thu, Apr 23, 2020 at 11:48:13AM +0100, Sudip Mukherjee wrote: > rxe_create_mmap_info() returns either NULL or an error value in ERR_PTR > and we only checked for NULL after return. We should be using > IS_ERR_OR_NULL to check for both. > > Signed-off-by: Sudip Mukherjee > drivers/infiniband/sw/rxe/rxe_queue.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/infiniband/sw/rxe/rxe_queue.c b/drivers/infiniband/sw/rxe/rxe_queue.c > index ff92704de32f..ef438ce4fcfa 100644 > +++ b/drivers/infiniband/sw/rxe/rxe_queue.c > @@ -45,7 +45,7 @@ int do_mmap_info(struct rxe_dev *rxe, struct mminfo __user *outbuf, > > if (outbuf) { > ip = rxe_create_mmap_info(rxe, buf_size, udata, buf); > - if (!ip) > + if (IS_ERR_OR_NULL(ip)) > goto err1; Same comment as for the rvt patch - do not use IS_ERR_OR_NULL. If a function uses the ERR_PTR stuff then it should not return NULL. Fix rxe_create_mmap_info and check all call sites Jason