drm: omapdrm: Add missing check for alloc_ordered_workqueue

commit e794b7b9b92977365c693760a259f8eef940c536 upstream.

As it may return NULL pointer and cause NULL pointer dereference. Add check
for the return value of alloc_ordered_workqueue.

Cc: stable@vger.kernel.org
Fixes: 2f95bc6d324a ("drm: omapdrm: Perform initialization/cleanup at probe/remove time")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240808061336.2796729-1-make24@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 53d5e184ee77cae0a8a57d4c20302be80e9805d0..8c664ef0cf629e099460b5d5182567b472862b59 100644 (file)
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -600,6 +600,10 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
        soc = soc_device_match(omapdrm_soc_devices);
        priv->omaprev = soc ? (unsigned int)soc->data : 0;
        priv->wq = alloc_ordered_workqueue("omapdrm", 0);
+       if (!priv->wq) {
+               ret = -ENOMEM;
+               goto err_alloc_workqueue;
+       }
 
        mutex_init(&priv->list_lock);
        INIT_LIST_HEAD(&priv->obj_list);
@@ -649,6 +653,7 @@ err_cleanup_modeset:
 err_gem_deinit:
        omap_gem_deinit(ddev);
        destroy_workqueue(priv->wq);
+err_alloc_workqueue:
        omap_disconnect_pipelines(ddev);
        omap_crtc_pre_uninit(priv);
        drm_dev_put(ddev);