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[Launchpad Bug Tracker <1489077@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1489077

Title:
  v4l2 can crash computer with badly written userland code

Status in linux package in Ubuntu:
  Expired

Bug description:
  In my simple bit of code to grab a frame from a webcam based on the
  example code given here:

  https://gist.github.com/Circuitsoft/1126411

  I found a badly crafted version would crash the computer (dead except
  for flashing keyboard lights).

  Simply calling ioctl(cam, VIDIOC_STREAMON, &buf.type) twice without
  calling VIDIOC_STREAMOFF inbetween causes the crash. I realise this
  code is incompetent but it shouldn't require a hard reboot to recover
  from it. I guess this might be rather system specific however it
  seemed worth reporting.

   I can't recall the last time I managed to crash a linux box from
  userland...

  Kernel: Ubuntu 3.13.0-62.102-generic 3.13.11-ckt24

  Camera: Bus 001 Device 002: ID 046d:0990 Logitech, Inc. QuickCam Pro
  9000

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