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[79.34.249.199]) by smtp.gmail.com with ESMTPSA id a7sm10239416eje.96.2021.02.09.01.00.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Feb 2021 01:00:16 -0800 (PST) Date: Tue, 9 Feb 2021 10:00:14 +0100 From: Stefano Garzarella To: Eli Cohen Cc: virtualization@lists.linux-foundation.org, "Michael S. Tsirkin" , Jason Wang , Parav Pandit , linux-kernel@vger.kernel.org Subject: Re: [PATCH] vdpa/mlx5: fix param validation in mlx5_vdpa_get_config() Message-ID: <20210209090014.xolf5kxri3xdmacz@steredhat> References: <20210208161741.104939-1-sgarzare@redhat.com> <20210209054302.GA210455@mtl-vdi-166.wap.labs.mlnx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20210209054302.GA210455@mtl-vdi-166.wap.labs.mlnx> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 09, 2021 at 07:43:02AM +0200, Eli Cohen wrote: >On Mon, Feb 08, 2021 at 05:17:41PM +0100, Stefano Garzarella wrote: >> It's legal to have 'offset + len' equal to >> sizeof(struct virtio_net_config), since 'ndev->config' is a >> 'struct virtio_net_config', so we can safely copy its content under >> this condition. >> >> Fixes: 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices") >> Cc: stable@vger.kernel.org >> Signed-off-by: Stefano Garzarella > >Acked-by: Eli Cohen > >BTW, same error in vdpa_sim you may want to fix. > Commit 65b709586e22 ("vdpa_sim: add get_config callback in vdpasim_dev_attr") unintentionally solved it. Since it's a simulator, maybe we can avoid solving it in the stable branches. Or does it matter? Thanks, Stefano >> --- >> drivers/vdpa/mlx5/net/mlx5_vnet.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c >> index dc88559a8d49..10e9b09932eb 100644 >> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c >> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c >> @@ -1820,7 +1820,7 @@ static void mlx5_vdpa_get_config(struct vdpa_device *vdev, unsigned int offset, >> struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev); >> struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev); >> >> - if (offset + len < sizeof(struct virtio_net_config)) >> + if (offset + len <= sizeof(struct virtio_net_config)) >> memcpy(buf, (u8 *)&ndev->config + offset, len); >> } >> >> -- >> 2.29.2 >> >