From: Stefano Garzarella <sgarzare@redhat.com> To: Eli Cohen <elic@nvidia.com> Cc: virtualization@lists.linux-foundation.org, "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, Parav Pandit <parav@nvidia.com>, linux-kernel@vger.kernel.org Subject: Re: [PATCH] vdpa/mlx5: fix param validation in mlx5_vdpa_get_config() Date: Tue, 9 Feb 2021 10:00:14 +0100 [thread overview] Message-ID: <20210209090014.xolf5kxri3xdmacz@steredhat> (raw) In-Reply-To: <20210209054302.GA210455@mtl-vdi-166.wap.labs.mlnx> 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 <sgarzare@redhat.com> > >Acked-by: Eli Cohen <elic@nvidia.com> > >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 >> >
WARNING: multiple messages have this Message-ID (diff)
From: Stefano Garzarella <sgarzare@redhat.com> To: Eli Cohen <elic@nvidia.com> Cc: "Michael S. Tsirkin" <mst@redhat.com>, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: Re: [PATCH] vdpa/mlx5: fix param validation in mlx5_vdpa_get_config() Date: Tue, 9 Feb 2021 10:00:14 +0100 [thread overview] Message-ID: <20210209090014.xolf5kxri3xdmacz@steredhat> (raw) In-Reply-To: <20210209054302.GA210455@mtl-vdi-166.wap.labs.mlnx> 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 <sgarzare@redhat.com> > >Acked-by: Eli Cohen <elic@nvidia.com> > >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 >> > _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2021-02-09 9:09 UTC|newest] Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-08 16:17 [PATCH] vdpa/mlx5: fix param validation in mlx5_vdpa_get_config() Stefano Garzarella 2021-02-08 16:17 ` Stefano Garzarella 2021-02-08 18:38 ` Michael S. Tsirkin 2021-02-08 18:38 ` Michael S. Tsirkin 2021-02-09 3:24 ` Jason Wang 2021-02-09 3:24 ` Jason Wang 2021-02-09 8:58 ` Stefano Garzarella 2021-02-09 8:58 ` Stefano Garzarella 2021-02-09 9:31 ` Michael S. Tsirkin 2021-02-09 9:31 ` Michael S. Tsirkin 2021-02-10 10:08 ` Stefano Garzarella 2021-02-10 10:08 ` Stefano Garzarella 2021-02-18 5:47 ` Jason Wang 2021-02-18 5:47 ` Jason Wang 2021-02-09 3:21 ` Jason Wang 2021-02-09 3:21 ` Jason Wang 2021-02-09 5:43 ` Eli Cohen 2021-02-09 9:00 ` Stefano Garzarella [this message] 2021-02-09 9:00 ` Stefano Garzarella 2021-02-10 4:17 ` Jason Wang 2021-02-10 4:17 ` Jason Wang 2021-02-10 12:12 ` Michael S. Tsirkin 2021-02-10 12:12 ` Michael S. Tsirkin 2021-02-11 15:39 ` Stefano Garzarella 2021-02-11 15:39 ` Stefano Garzarella
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