qemu: Avoid crash in qemuDomainCheckCPU with unknown host CPU

When we don't have any information about host CPU (for example when
running on an aarch64 host), the virQEMUCapsGetHostModel would return
NULL.

Fixes: f928eb5fc80ca0ed7277f2513b63aed36c09d275
Fixes: https://gitlab.com/libvirt/libvirt/-/issues/747
Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Tested-by: Jaroslav Suchanek <jsuchane@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index cf05dca55ae1b54b21c93d52b8de794a2759daca..df1ed0223d3e4659813e3eefec711aa86f48df17 100644 (file)
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -11430,6 +11430,7 @@ qemuDomainCheckCPU(virArch arch,
     /* Force compat check if the CPU model is not found in qemuCaps or
      * we don't have host CPU data from QEMU */
     if (!cpu->model ||
+        !hypervisorCPU ||
         hypervisorCPU->fallback != VIR_CPU_FALLBACK_FORBID ||
         virQEMUCapsGetCPUBlockers(qemuCaps, virtType,
                                   cpu->model, &blockers) < 0)