Thread (8 messages) 8 messages, 3 authors, 2021-02-18

Re: [PATCH] vdpa/mlx5: fix param validation in mlx5_vdpa_get_config()

From: Jason Wang <jasowang@redhat.com>
Date: 2021-02-09 03:32:38
Also in: lkml

On 2021/2/9 上午12:17, 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: Jason Wang <jasowang@redhat.com>

quoted hunk ↗ jump to hunk
---
  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);
  }
  
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