File 541e9ae6-cpu-vendor-crash-fix.patch of Package libvirt.8364

commit 541e9ae6d4290b9004ed73648ea663563b329b3d
Author: Jim Fehlig <>
Date:   Fri Aug 5 15:23:47 2016 -0600

    cpu_x86: fix libvirtd crash when host cpu vendor is not available
    When starting a guest and copying host vendor cpuid to the guest
    cpu, libvirtd would crash if the host cpu contained a NULL vendor
    field. Avoid the crash by checking for a valid vendor in the host
    cpu before copying the cpuid to the guest cpu.
    For completeness, here is a backtrace from the crash
    (gdb) bt
    f0  0x00007ffff739bf33 in x86DataCpuid (cpuid=0x8, cpuid=0x8,
        data=data@entry=0x7fffb800ee78) at cpu/cpu_x86.c:287
    f1  virCPUx86DataAddCPUID (data=data@entry=0x7fffb800ee78, cpuid=0x8)
        at cpu/cpu_x86.c:355
    f2  0x00007ffff739ef47 in x86Compute (host=<optimized out>, cpu=0x7fffb8000cc0,
        guest=0x7fffecca7348, message=<optimized out>) at cpu/cpu_x86.c:1580
    f3  0x00007fffd2b38e53 in qemuBuildCpuModelArgStr (migrating=false,
        hasHwVirt=<synthetic pointer>, qemuCaps=0x7fffb8001040, buf=0x7fffecca7360,
        def=0x7fffc400ce20, driver=0x1c) at qemu/qemu_command.c:6283
    f4  qemuBuildCpuCommandLine (cmd=cmd@entry=0x7fffb8002f60,
        driver=driver@entry=0x7fffc80882c0, def=def@entry=0x7fffc400ce20,
        qemuCaps=qemuCaps@entry=0x7fffb8001040, migrating=<optimized out>)
        at qemu/qemu_command.c:6445
    (gdb) f2
    (gdb) p *host_model
    $23 = {name = 0x7fffb800ec50 "qemu64", vendor = 0x0, signature = 0, data = {
        len = 2, data = 0x7fffb800e720}}

Index: libvirt-2.0.0/src/cpu/cpu_x86.c
--- libvirt-2.0.0.orig/src/cpu/cpu_x86.c
+++ libvirt-2.0.0/src/cpu/cpu_x86.c
@@ -1576,7 +1576,7 @@ x86Compute(virCPUDefPtr host,
         if (!(guest_model = x86ModelCopy(host_model)))
             goto error;
-        if (cpu->vendor &&
+        if (cpu->vendor && host_model->vendor &&
                                   &host_model->vendor->cpuid) < 0)
             goto error;
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