linux-kernel - Re: [PATCH] vfio: fix potential memory leak in vfio_msi_cap

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Message-ID: <20180904095250.32e170c5@t450s.home>
Date:   Tue, 4 Sep 2018 09:52:50 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Li Qiang <liq3ea@...il.com>
Cc:     eric.auger@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, liqiang02@...p.netease.com
Subject: Re: [PATCH] vfio: fix potential memory leak in vfio_msi_cap_len

On Mon, 27 Aug 2018 05:47:21 -0700
Li Qiang <liq3ea@...il.com> wrote:

> Free the vdev->msi_perm in error path.
> 
> Signed-off-by: Li Qiang <liq3ea@...il.com>
> ---
>  drivers/vfio/pci/vfio_pci_config.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
> index 115a36f6f403..62023b4a373b 100644
> --- a/drivers/vfio/pci/vfio_pci_config.c
> +++ b/drivers/vfio/pci/vfio_pci_config.c
> @@ -1180,8 +1180,10 @@ static int vfio_msi_cap_len(struct vfio_pci_device *vdev, u8 pos)
>  		return -ENOMEM;
>  
>  	ret = init_pci_cap_msi_perm(vdev->msi_perm, len, flags);
> -	if (ret)
> +	if (ret) {
> +		kfree(vdev->msi_perm);
>  		return ret;
> +	}
>  
>  	return len;
>  }

Fix looks correct to me, I'll queue this for v4.20 with Eric's R-b.
Thanks,

Alex