linux-kernel - [PATCH v2] drm/panthor: validate group queue count

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Message-ID: <20250903192133.288477-1-olvaffe@gmail.com>
Date: Wed,  3 Sep 2025 12:21:33 -0700
From: Chia-I Wu <olvaffe@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	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>,
	Grant Likely <grant.likely@...aro.org>,
	Heiko Stuebner <heiko@...ech.de>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/panthor: validate group queue count

A panthor group can have at most MAX_CS_PER_CSG panthor queues.

Fixes: 4bdca11507928 ("drm/panthor: Add the driver frontend block")
Signed-off-by: Chia-I Wu <olvaffe@...il.com>
Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com> # v1
Reviewed-by: Steven Price <steven.price@....com>

---
v2:
 - move validation up to panthor_ioctl_group_create
 - add Fixes tag
---
 drivers/gpu/drm/panthor/panthor_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
index 9256806eb6623..4c202fc5ce050 100644
--- a/drivers/gpu/drm/panthor/panthor_drv.c
+++ b/drivers/gpu/drm/panthor/panthor_drv.c
@@ -1094,7 +1094,7 @@ static int panthor_ioctl_group_create(struct drm_device *ddev, void *data,
 	struct drm_panthor_queue_create *queue_args;
 	int ret;
 
-	if (!args->queues.count)
+	if (!args->queues.count || args->queues.count > MAX_CS_PER_CSG)
 		return -EINVAL;
 
 	ret = PANTHOR_UOBJ_GET_ARRAY(queue_args, &args->queues);
-- 
2.51.0.338.gd7d06c2dae-goog