[PATCH v2 02/12] vkms: properly compute gamma LUT size in vkms_atomic_check()

[Leandro Ribeiro <leandro.ribeiro@collabora.com>]

Gamma LUT size is being computed wrongly, dividing blob size by
sizeof(struct drm_color_lut *). But the blob is an array of struct
drm_color_lut.

Replace sizeof(struct drm_color_lut *) with sizeof(struct
drm_color_lut), properly validating the userspace gamma LUT size.

Issue caught by Sashiko bot:
https://sashiko.dev/#/patchset/20260804203351.148521-1-leandro.ribeiro@collabora.com?part=1

Reported-by: Sashiko <sashiko-bot@kernel.org>
Reviewed-by: Robert Mader <robert.mader@collabora.com>
Tested-by: Robert Mader <robert.mader@collabora.com>
Signed-off-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
---
 drivers/gpu/drm/vkms/vkms_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vkms/vkms_drv.c b/drivers/gpu/drm/vkms/vkms_drv.c
index 86a8a95694fd..28b99511f186 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.c
+++ b/drivers/gpu/drm/vkms/vkms_drv.c
@@ -112,7 +112,7 @@ static int vkms_atomic_check(struct drm_device *dev, struct drm_atomic_commit *s
 		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 *)
+		if (new_crtc_state->gamma_lut->length / sizeof(struct drm_color_lut)
 		    > VKMS_GAMMA_LUT_SIZE)
 			return -EINVAL;
 	}
-- 
2.56.0