From: Eiichi Tsukata eiichi.tsukata@nutanix.com
commit 7353633814f6e5b4899fb9ee1483709d6bb0e1cd upstream.
Should not call eventfd_ctx_put() in case of error.
Fixes: 2fd6df2f2b47 ("KVM: x86/xen: intercept EVTCHNOP_send from guests") Reported-by: syzbot+6f0c896c5a9449a10ded@syzkaller.appspotmail.com Signed-off-by: Eiichi Tsukata eiichi.tsukata@nutanix.com Message-Id: 20221028092631.117438-1-eiichi.tsukata@nutanix.com [Introduce new goto target instead. - Paolo] Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/xen.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -1667,18 +1667,18 @@ static int kvm_xen_eventfd_assign(struct case EVTCHNSTAT_ipi: /* IPI must map back to the same port# */ if (data->u.evtchn.deliver.port.port != data->u.evtchn.send_port) - goto out; /* -EINVAL */ + goto out_noeventfd; /* -EINVAL */ break;
case EVTCHNSTAT_interdomain: if (data->u.evtchn.deliver.port.port) { if (data->u.evtchn.deliver.port.port >= max_evtchn_port(kvm)) - goto out; /* -EINVAL */ + goto out_noeventfd; /* -EINVAL */ } else { eventfd = eventfd_ctx_fdget(data->u.evtchn.deliver.eventfd.fd); if (IS_ERR(eventfd)) { ret = PTR_ERR(eventfd); - goto out; + goto out_noeventfd; } } break; @@ -1718,6 +1718,7 @@ static int kvm_xen_eventfd_assign(struct out: if (eventfd) eventfd_ctx_put(eventfd); +out_noeventfd: kfree(evtchnfd); return ret; }