Re: [PATCH 4.14-stable backport] vfio: ccw: only free cp on final interrupt

[Greg KH <greg@kroah.com>]

On Mon, Apr 01, 2019 at 03:14:25PM +0200, Cornelia Huck wrote:
> When we get an interrupt for a channel program, it is not
> necessarily the final interrupt; for example, the issuing
> guest may request an intermediate interrupt by specifying
> the program-controlled-interrupt flag on a ccw.
> 
> We must not switch the state to idle if the interrupt is not
> yet final; even more importantly, we must not free the translated
> channel program if the interrupt is not yet final, or the host
> can crash during cp rewind.
> 
> Fixes: e5f84dbaea59 ("vfio: ccw: return I/O results asynchronously")
> Cc: stable@vger.kernel.org # v4.12+
> Reviewed-by: Eric Farman <farman@linux.ibm.com>
> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
> (cherry picked from commit 50b7f1b7236bab08ebbbecf90521e84b068d7a17)
> ---
>  drivers/s390/cio/vfio_ccw_drv.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)

Now queued up, thanks.

greg k-h