linux-kernel - Re: [PATCH] drm: vkms: check status of alloc_ordered

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Message-Id: <9E681935-0B8D-4157-AED7-A851FA265BC7@umn.edu>
Date:   Fri, 22 Mar 2019 21:32:07 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Rodrigo Siqueira <rodrigosiqueiramelo@...il.com>,
        Haneen Mohammed <hamohammed.sa@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: vkms: check status of alloc_ordered_workqueue



> On Mar 8, 2019, at 10:36 PM, Kangjie Lu <kjlu@....edu> wrote:
> 
> alloc_ordered_workqueue may fail and return NULL.
> The fix returns ENOMEM when it fails to avoid potential NULL
> pointer dereference.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
> drivers/gpu/drm/vkms/vkms_crtc.c | 2 ++
> 1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
> index 8a9aeb0a9ea8..bb66dbcd5e3f 100644
> --- a/drivers/gpu/drm/vkms/vkms_crtc.c
> +++ b/drivers/gpu/drm/vkms/vkms_crtc.c
> @@ -219,6 +219,8 @@ int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
> 	spin_lock_init(&vkms_out->state_lock);
> 
> 	vkms_out->crc_workq = alloc_ordered_workqueue("vkms_crc_workq", 0);
> +	if (!vkms_out->crc_workq)
> +		return -ENOMEM;

Is this a reasonable patch?

> 
> 	return ret;
> }
> -- 
> 2.17.1
>