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 <[email protected]>

Reviewed-by Boris Brezillon <[email protected]> # v1

Reviewed-by Steven Price <[email protected]>

---
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(-)

drivers/gpu/drm/panthor/panthor_drv.c +1 -1

index 9256806eb6623..4c202fc5ce050 100644
@@ -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);