In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref<\/p>\n
airspy_disconnect() clears s->udev under v4l2_lock, but
\nairspy_stop_streaming() unconditionally calls airspy_ctrl_msg() and
\nairspy_free_stream_bufs() afterwards. If a streaming user closes the
\ndevice after disconnect, stop_streaming() runs and dereferences the
\nNULL s->udev:<\/p>\n
airspy_stop_streaming()
\n airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0)
\n usb_sndctrlpipe(s->udev, 0) \/* NULL deref *\/
\n airspy_free_stream_bufs(s)
\n usb_free_coherent(s->udev, …) \/* NULL deref *\/<\/p>\n
The airspy driver uses vb2_fop_release() in its file_operations, so
\nreplace video_unregister_device(&s->vdev) with
\nvb2_video_unregister_device(&s->vdev) and move it before clearing
\ns->udev. vb2_video_unregister_device() releases the vb2 queue, which
\nsynchronously runs airspy_stop_streaming() if streaming is active, so
\nthe URBs, coherent DMA stream buffers and the hardware stop control
\nmessage all execute while s->udev is still valid.<\/p>\n
vb2_video_unregister_device() locks vdev->queue->lock (vb_queue_lock)
\ninternally, and stop_streaming() locks v4l2_lock, so the previous outer
\nmutex_lock(&s->vb_queue_lock) \/ mutex_lock(&s->v4l2_lock) pair around
\nthe unregister sequence would self-deadlock and has been removed. A
\nshort v4l2_lock critical section around s->udev = NULL remains so any
\nioctl path that still holds the file descriptor sees coherent state.<\/p>\n
Issue identified by automated review of the INV-003 series at
\nhttps:\/\/sashiko.dev\/<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
media: airspy: use vb2_video_unregister_device() on disconnect to fix NULL deref<\/p>\n
airspy_disconnect() clears s->udev under v4l2_loc<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24588","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24588","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=24588"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24588"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}