Commit 6a544355 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Prevent overflow in KVM_GET_SUPPORTED_CPUID



The number of entries is multiplied by the entry size, which can
overflow on 32-bit hosts.  Bound the entry count instead.
Reported-by: default avatarDavid Wagner <daw@cs.berkeley.edu>
Cc: stable@kernel.org
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent eb5109e3
......@@ -1591,6 +1591,8 @@ static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
if (cpuid->nent < 1)
goto out;
if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
cpuid->nent = KVM_MAX_CPUID_ENTRIES;
r = -ENOMEM;
cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
if (!cpuid_entries)
......
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