Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  comedi: ni_atmio16d: Fix invalid clean-up after failed attach  If the driver's COMEDI "attach" handler function (`atmio16d_attach()`) returns an error, the COMEDI core will call the driver's "detach" handler function (`atmio16d_detach()`) to clean up.  This calls `reset_atmio16d()` unconditionally, but depending on where the error occurred in the attach handler, the device may not have been sufficiently initialized to call `reset_atmio16d()`.  It uses `dev->iobase` as the I/O port base address and `dev->private` as the pointer to the COMEDI device's private data structure.  `dev->iobase` may still be set to its initial value of 0, which would result in undesired writes to low I/O port addresses.  `dev->private` may still be `NULL`, which would result in null pointer dereferences.  Fix `atmio16d_detach()` by checking that `dev->private` is valid (non-null) before calling `reset_atmio16d()`.  This implies that `dev->iobase` was set correctly since that is set up before `dev->private`.