Description: KVM: NULL pointer dereference in kvm_dirty_ring_get() in virt/kvm/dirty_ring.c
References:
 https://lore.kernel.org/kvm/CAFcO6XOmoS7EacN_n6v4Txk7xL7iqRa2gABg3F7E3Naf5uG94g@mail.gmail.com/
 https://patchwork.kernel.org/project/kvm/patch/20211121125451.9489-12-dwmw2@infradead.org/
 https://bugzilla.redhat.com/show_bug.cgi?id=2031194
 https://www.openwall.com/lists/oss-security/2021/12/14/2
Notes:
Bugs:
upstream:
5.10-upstream-stable:
4.19-upstream-stable:
4.9-upstream-stable:
sid:
5.10-bullseye-security:
4.19-buster-security:
4.9-stretch-security: