vfio: ccw: only free cp on final interrupt

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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: e5f84dbaea ("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>

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Cornelia Huck 2019-03-11 10:59:53 +01:00

parent 152e9b8676

commit 50b7f1b723

1 changed files with 6 additions and 2 deletions

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8

drivers/s390/cio/vfio_ccw_drv.c

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