From: Mark McLoughlin <mar...@redhat.com>

If we run out of cpuid entries for extended request types
we should return -E2BIG, just like we do for the standard
request types.

Signed-off-by: Mark McLoughlin <mar...@redhat.com>
Signed-off-by: Avi Kivity <a...@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5426081..b332981 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1465,6 +1465,10 @@ static int kvm_dev_ioctl_get_supported_cpuid(struct 
kvm_cpuid2 *cpuid,
        for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
                do_cpuid_ent(&cpuid_entries[nent], func, 0,
                             &nent, cpuid->nent);
+       r = -E2BIG;
+       if (nent >= cpuid->nent)
+               goto out_free;
+
        r = -EFAULT;
        if (copy_to_user(entries, cpuid_entries,
                         nent * sizeof(struct kvm_cpuid_entry2)))
--
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