tree 5d698890a0f6ab87af4c647908395f51d30e8356
parent 1a695a905c18548062509178b98bc91e67510864
author Alex Williamson <alex.williamson@redhat.com> 1464616210 -0600
committer Alex Williamson <alex.williamson@redhat.com> 1464616210 -0600

vfio/pci: Fix ordering of eventfd vs virqfd shutdown

Both the INTx and MSI/X disable paths do an eventfd_ctx_put() for the
trigger eventfd before calling vfio_virqfd_disable() any potential
mask and unmask eventfds.  This opens a use-after-free race where an
inopportune irqfd can reference the freed signalling eventfd.  Reorder
to avoid this possibility.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>