CyberRota Analysis
AI-GeneratedThe vulnerability in the Linux kernel affects the DMA engine, specifically in the idxd driver, where improper handling of device references during setup can lead to a deadlock situation. This flaw may result in operations on freed memory, potentially leading to system instability or crashes. Organizations using affected Linux kernels, particularly those relying on the idxd driver for device management, should prioritize applying the fix to mitigate these risks.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open() The failed_dev_add and failed_dev_name paths drop the file-device reference while wq->wq_lock is still held. If put_device(fdev) drops the last reference, idxd_file_dev_release() runs synchronously and tries to take wq->wq_lock again, deadlocking. Those paths also fall through into the later ctx cleanup labels even though idxd_file_dev_release() owns that cleanup and frees ctx. This can make idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context. Move idxd_wq_get() before file-device setup can fail, since the release callback always calls idxd_wq_put(). Then unlock wq->wq_lock before put_device(fdev) and return directly from the file-device setup failure path, leaving ctx cleanup to the release callback.