linux-kernel - Re: [PATCH] drm/vmwgfx: Fix memory leak in vmw_mksstat_add

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Date:   Sat, 17 Sep 2022 09:35:23 +0300
From:   "Martin Krastev (VMware)" <martinkrastev768@...il.com>
To:     Rafael Mendonca <rafaelmendsr@...il.com>,
        Zack Rusin <zackr@...are.com>,
        VMware Graphics Reviewers 
        <linux-graphics-maintainer@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Martin Krastev <krastevm@...are.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/vmwgfx: Fix memory leak in vmw_mksstat_add_ioctl()

Thank you for the catch!

Reviewed-by: Martin Krastev <krastevm@...are.com>


Regards,

Martin



On 16.09.22 г. 23:47 ч., Rafael Mendonca wrote:
> If the copy of the description string from userspace fails, then the page
> for the instance descriptor doesn't get freed before returning -EFAULT,
> which leads to a memleak.
>
> Fixes: 7a7a933edd6c ("drm/vmwgfx: Introduce VMware mks-guest-stats")
> Signed-off-by: Rafael Mendonca <rafaelmendsr@...il.com>
> ---
>   drivers/gpu/drm/vmwgfx/vmwgfx_msg.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
> index 2aceac7856e2..089046fa21be 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
> @@ -1076,6 +1076,7 @@ int vmw_mksstat_add_ioctl(struct drm_device *dev, void *data,
>   
>   	if (desc_len < 0) {
>   		atomic_set(&dev_priv->mksstat_user_pids[slot], 0);
> +		__free_page(page);
>   		return -EFAULT;
>   	}
>