linux-kernel - Re: [PATCH] drm/panthor: validate group queue count

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Message-ID: <20250903093835.69763656@fedora>
Date: Wed, 3 Sep 2025 09:38:35 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Chia-I Wu <olvaffe@...il.com>
Cc: Steven Price <steven.price@....com>, Liviu Dudau <liviu.dudau@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard
 <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, David Airlie
 <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panthor: validate group queue count

On Tue,  2 Sep 2025 12:20:01 -0700
Chia-I Wu <olvaffe@...il.com> wrote:

> A panthor group can have at most MAX_CS_PER_CSG panthor queues.
> 
> Signed-off-by: Chia-I Wu <olvaffe@...il.com>

With a proper Fixes tag, this is

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/gpu/drm/panthor/panthor_sched.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index ba5dc3e443d9c..249ab889ca91f 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -3473,6 +3473,9 @@ int panthor_group_create(struct panthor_file *pfile,
>  	    hweight64(group_args->tiler_core_mask) < group_args->max_tiler_cores)
>  		return -EINVAL;
>  
> +	if (group_args->queues.count > MAX_CS_PER_CSG)
> +		return -EINVAL;
> +
>  	group = kzalloc(sizeof(*group), GFP_KERNEL);
>  	if (!group)
>  		return -ENOMEM;