[PATCH for-5.2 1/5] spapr/xive: Fix xive->fd if kvm_create_device() fails

[Greg Kurz]

If the creation of the KVM XIVE device fails for some reasons, the
negative errno ends up in xive->fd, but the rest of the code assumes
that xive->fd either contains an open fd, ie. positive value, or -1.

This doesn't cause any misbehavior except kvmppc_xive_disconnect()
that will try to close(xive->fd) during rollback and likely be
rewarded with an EBADF.

Only set xive->fd with a open fd.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 hw/intc/spapr_xive_kvm.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c
index edb7ee0e74f1..d55ea4670e0e 100644
--- a/hw/intc/spapr_xive_kvm.c
+++ b/hw/intc/spapr_xive_kvm.c
@@ -745,6 +745,7 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, 
uint32_t nr_servers,
     size_t esb_len = (1ull << xsrc->esb_shift) * xsrc->nr_irqs;
     size_t tima_len = 4ull << TM_SHIFT;
     CPUState *cs;
+    int fd;
 
     /*
      * The KVM XIVE device already in use. This is the case when
@@ -760,11 +761,12 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, 
uint32_t nr_servers,
     }
 
     /* First, create the KVM XIVE device */
-    xive->fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
-    if (xive->fd < 0) {
-        error_setg_errno(errp, -xive->fd, "XIVE: error creating KVM device");
+    fd = kvm_create_device(kvm_state, KVM_DEV_TYPE_XIVE, false);
+    if (fd < 0) {
+        error_setg_errno(errp, -fd, "XIVE: error creating KVM device");
         return -1;
     }
+    xive->fd = fd;
 
     /* Tell KVM about the # of VCPUs we may have */
     if (kvm_device_check_attr(xive->fd, KVM_DEV_XIVE_GRP_CTRL,