-
Eric Biggers authored
If you register a kvm_coalesced_mmio_zone with '.pio = 0' but then unregister it with '.pio = 1', KVM_UNREGISTER_COALESCED_MMIO will try to unregister it from KVM_PIO_BUS rather than KVM_MMIO_BUS, which is a no-op. But it frees the kvm_coalesced_mmio_dev anyway, causing a use-after-free. Fix it by only unregistering and freeing the zone if the correct value of 'pio' is provided. Reported-by: syzbot+f87f60bb6f13f39b54e3@syzkaller.appspotmail.com Fixes: 0804c849 ("kvm/x86 : add coalesced pio support") Signed-off-by:
Eric Biggers <ebiggers@google.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
987d1149