linux-kernel - Re: [PATCH] drm/fsl-dcu: Fix no fb check bug

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Message-ID: <c1f2ea5c161e8bdd4d3c6109543404d0@agner.ch>
Date:	Mon, 16 Nov 2015 14:34:11 -0800
From:	Stefan Agner <stefan@...er.ch>
To:	airlied@...ux.ie
Cc:	dri-devel@...ts.freedesktop.org,
	"Jianwei Wang <jianwei.wang.chn@...il.com>" 
	<linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] drm/fsl-dcu: Fix no fb check bug

Hi,

This avoids a NULL pointer dereference when no crtc is available (e.g.
the fsl,panel not assigned).

Any chance to get this into 4.4?

Tested-by: Stefan Agner <stefan@...er.ch>

--
Stefan

On 2015-08-30 20:39, Jianwei Wang wrote:
> For state->fb may be NULL in fsl_dcu_drm_plane_atomic_check function,
> if so, return -EINVAL. No need check in fsl_dcu_drm_plane_atomic_update
> anymore.
> 
> Signed-off-by: Jianwei Wang <jianwei.wang.chn@...il.com>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> index 82be6b8..8787920 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_plane.c
> @@ -41,6 +41,9 @@ static int fsl_dcu_drm_plane_atomic_check(struct
> drm_plane *plane,
>  {
>  	struct drm_framebuffer *fb = state->fb;
>  
> +	if (!fb)
> +		return -EINVAL;
> +
>  	switch (fb->pixel_format) {
>  	case DRM_FORMAT_RGB565:
>  	case DRM_FORMAT_RGB888:
> @@ -84,9 +87,6 @@ static void fsl_dcu_drm_plane_atomic_update(struct
> drm_plane *plane,
>  	unsigned int alpha, bpp;
>  	int index, ret;
>  
> -	if (!fb)
> -		return;
> -
>  	index = fsl_dcu_drm_plane_index(plane);
>  	if (index < 0)
>  		return;
--
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