linux-kernel - Re: [PATCH] drm/vkms: fix gamma LUT size check

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Message-ID: <5ee4e72c-0862-40b3-b47b-70ca5d8f89c1@bootlin.com>
Date: Fri, 6 Feb 2026 14:53:41 +0100
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Renjun Wang <renjunw0@...mail.com>, hamohammed.sa@...il.com,
 simona@...ll.ch, melissa.srw@...il.com, maarten.lankhorst@...ux.intel.com,
 mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/vkms: fix gamma LUT size check



On 2/4/26 15:15, Renjun Wang wrote:
> vkms_atomic_check() computed the gamma LUT entry count using
> sizeof(struct drm_color_lut *), which uses pointer size and
> can incorrectly reject or accept LUT sizes. Use
> drm_color_lut_size() instead to validate against VKMS_LUT_SIZE.
> 
> Signed-off-by: Renjun Wang <renjunw0@...mail.com>

Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>

Like for the YUV patch, were you able to reproduce it using a tool?

> ---
>   drivers/gpu/drm/vkms/vkms_drv.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
> index dd1402f43773..a09589949f48 100644
> --- a/drivers/gpu/drm/vkms/vkms_drv.c
> +++ b/drivers/gpu/drm/vkms/vkms_drv.c
> @@ -17,6 +17,7 @@
>   #include <drm/drm_gem.h>
>   #include <drm/drm_atomic.h>
>   #include <drm/drm_atomic_helper.h>
> +#include <drm/drm_color_mgmt.h>
>   #include <drm/drm_drv.h>
>   #include <drm/drm_fbdev_shmem.h>
>   #include <drm/drm_file.h>
> @@ -111,8 +112,7 @@ static int vkms_atomic_check(struct drm_device *dev, struct drm_atomic_state *st
>   		if (!new_crtc_state->gamma_lut || !new_crtc_state->color_mgmt_changed)
>   			continue;
>   
> -		if (new_crtc_state->gamma_lut->length / sizeof(struct drm_color_lut *)
> -		    > VKMS_LUT_SIZE)
> +		if (drm_color_lut_size(new_crtc_state->gamma_lut) > VKMS_LUT_SIZE)
>   			return -EINVAL;
>   	}
>