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[SA <1489077@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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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:
  Incomplete

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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