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Janosch Frank authored
commit e1e8a962 upstream. User controlled KVM guests do not support the dirty log, as they have no single gmap that we can check for changes. As they have no single gmap, kvm->arch.gmap is NULL and all further referencing to it for dirty checking will result in a NULL dereference. Let's return -EINVAL if a caller tries to sync dirty logs for a UCONTROL guest. Fixes: 15f36ebd ("KVM: s390: Add proper dirty bitmap support to S390 kvm.") Signed-off-by:
Janosch Frank <frankja@linux.vnet.ibm.com> Reported-by:
Martin Schwidefsky <schwidefsky@de.ibm.com> Reviewed-by:
Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by:
Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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