Ian Abbott ee280d134f
staging: comedi: das08: fix possible NULL deref during detach ...
`das08_detach()` is called by the comedi core to clean up if either
`das08_attach()` or `das08_attach_pci()` returns an error. It sets
`thisboard` to the return value of `comedi_board(dev)` and assumes it is
non-null. This is a valid assumption if `das08_attach()` fails, but not
if `das08_attach_pci()` fails, leading to a possible NULL pointer
dereference.
Check `thisboard` at the top of `das08_detach()` and return early if it
is `NULL`. This is okay because the only other thing that could have
been allocated is `dev->private` and that is freed by the comedi core,
not by this function.
Cc: <stable@vger.kernel.org > # 3.6.x
Signed-off-by: Ian Abbott <abbotti@mev.co.uk >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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