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If a streaming user closes the device after disconnect, stop_streaming() runs and dereferences the NULL s->udev: airspy_stop_streaming() airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0) usb_sndctrlpipe(s->udev, 0) /* NULL deref */ airspy_free_stream_bufs(s) usb_free_coherent(s->udev, ...) /* NULL deref */ Mirror the precedent set by sibling SDR drivers msi2500 and pwc, which already guard their hardware teardown block with an "if (udev)" check. The queued-buffer drain via airspy_cleanup_queued_bufs() must still run unconditionally so vb2 sees its buffers returned. Issue identified by automated review of the INV-003 series at https://sashiko.dev/ Fixes: 634fe5033951 ("[media] airspy: AirSpy SDR driver") Cc: stable@vger.kernel.org Signed-off-by: Valery Borovsky --- drivers/media/usb/airspy/airspy.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/media/usb/airspy/airspy.c b/drivers/media/usb/airspy/airspy.c index 8f6b721ba107..50db02d35213 100644 --- a/drivers/media/usb/airspy/airspy.c +++ b/drivers/media/usb/airspy/airspy.c @@ -584,12 +584,14 @@ static void airspy_stop_streaming(struct vb2_queue *vq) mutex_lock(&s->v4l2_lock); - /* stop hardware streaming */ - airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0); + if (s->udev) { + /* stop hardware streaming */ + airspy_ctrl_msg(s, CMD_RECEIVER_MODE, 0, 0, NULL, 0); - airspy_kill_urbs(s); - airspy_free_urbs(s); - airspy_free_stream_bufs(s); + airspy_kill_urbs(s); + airspy_free_urbs(s); + airspy_free_stream_bufs(s); + } airspy_cleanup_queued_bufs(s); -- 2.51.0