linux-kernel - Re: [PATCH] vdpasim: fix memory leak when freeing IOTLBs

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Date:   Tue, 13 Dec 2022 16:38:49 +0530
From:   Gautam Dawar <gdawar@....com>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com
Cc:     gautam.dawar@...inx.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vdpasim: fix memory leak when freeing IOTLBs


On 12/13/22 14:37, Jason Wang wrote:
> CAUTION: This message has originated from an External Source. Please use proper judgment and caution when opening attachments, clicking links, or responding to this email.
>
>
> After commit bda324fd037a ("vdpasim: control virtqueue support"),
> vdpasim->iommu became an array of IOTLB, so we should clean the
> mappings of each free one by one instead of just deleting the ranges
> in the first IOTLB which may leak maps.
>
> Fixes: bda324fd037a ("vdpasim: control virtqueue support")
> Cc: Gautam Dawar <gautam.dawar@...inx.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>   drivers/vdpa/vdpa_sim/vdpa_sim.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index b071f0d842fb..9668dc477843 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -690,7 +690,9 @@ static void vdpasim_free(struct vdpa_device *vdpa)
>          }
>
>          kvfree(vdpasim->buffer);
> -       vhost_iotlb_free(vdpasim->iommu);
> +       for (i = 0; i < vdpasim->dev_attr.nas; i++)
> +               vhost_iotlb_reset(&vdpasim->iommu[i]);
> +       kfree(vdpasim->iommu);
>          kfree(vdpasim->vqs);
>          kfree(vdpasim->config);
>   }
> --
> 2.25.1
>
Looks good to me.

Reviewed-by: Gautam Dawar <gautam.dawar@....com>