CVE-2026-89881media: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak

Official description

In the Linux kernel, the following vulnerability has been resolved: media: rtl2832_sdr: use vb2_video_unregister_device() on remove to fix DMA leak rtl2832_sdr_remove() runs on USB disconnect and clears dev->udev to NULL before any pending streaming teardown has run. When user space later closes its file descriptor, vb2 calls rtl2832_sdr_stop_streaming() which in turn calls rtl2832_sdr_free_stream_bufs(). That helper releases each coherent buffer with: usb_free_coherent(dev->udev, dev->buf_size, dev->buf_list[dev->buf_num], dev->dma_addr[dev->buf_num]); usb_free_coherent() returns immediately when its dev argument is NULL, so every DMA stream buffer that was live at disconnect is silently leaked. The URBs allocated in rtl2832_sdr_alloc_urbs() outlive the device for the same reason. The rtl2832_sdr driver uses vb2_fop_release() in its file_operations, so replace video_unregister_device(&dev->vdev) with vb2_video_unregister_device(&dev->vdev) and move it before clearing dev->udev. vb2_video_unregister_device() releases the vb2 queue, which synchronously runs rtl2832_sdr_stop_streaming() if streaming is active, so URBs and coherent DMA stream buffers are freed while dev->udev is still valid. vb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock) internally, and stop_streaming() locks v4l2_lock, so the previous outer mutex_lock(&dev->vb_queue_lock) / mutex_lock(&dev->v4l2_lock) pair around the unregister sequence would self-deadlock and has been removed. A short v4l2_lock critical section around dev->udev = NULL remains so any ioctl path that still holds the file descriptor sees coherent state. Issue identified by automated review of the INV-003 series at https://sashiko.dev/

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/234c46b95a032232e31fa5987b84fb8f87a9693b
• https://git.kernel.org/stable/c/034b6a4f9589c04bc3f2bd5125658cd72d3e17c8
• https://git.kernel.org/stable/c/0ef9f19010ae4ba93aca211ea8f0081b9bf7aab2
• https://git.kernel.org/stable/c/053581d4657c6b5289c5de71a4828d313c005189
• https://git.kernel.org/stable/c/bbf15e83c37d9ac938b7c35c02b748fe54230010
• https://git.kernel.org/stable/c/7443b16b6dd8889a3b9c5236a09e7c58f0d11dae
• https://git.kernel.org/stable/c/a0d9d9a3b41a1346c26af57aade6ba3f552fa171
• https://git.kernel.org/stable/c/dabb047c62668f280998e29117c55e41aabac336