From: Jim Mattson <[email protected]> commit e8ab8d24b488632d07ce5ddb261f1d454114415b upstream.
The size checks in vmx_nested_state are wrong because the calculations are made based on the size of a pointer to a struct kvm_nested_state rather than the size of a struct kvm_nested_state. Reported-by: Felix Wilhelm <[email protected]> Signed-off-by: Jim Mattson <[email protected]> Reviewed-by: Drew Schmitt <[email protected]> Reviewed-by: Marc Orr <[email protected]> Reviewed-by: Peter Shier <[email protected]> Reviewed-by: Krish Sadhukhan <[email protected]> Fixes: 8fcc4b5923af5de58b80b53a069453b135693304 Cc: [email protected] Signed-off-by: Paolo Bonzini <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/x86/kvm/vmx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -14236,7 +14236,7 @@ static int vmx_set_nested_state(struct k return ret; /* Empty 'VMXON' state is permitted */ - if (kvm_state->size < sizeof(kvm_state) + sizeof(*vmcs12)) + if (kvm_state->size < sizeof(*kvm_state) + sizeof(*vmcs12)) return 0; if (kvm_state->vmx.vmcs_pa == kvm_state->vmx.vmxon_pa || @@ -14269,7 +14269,7 @@ static int vmx_set_nested_state(struct k if (nested_cpu_has_shadow_vmcs(vmcs12) && vmcs12->vmcs_link_pointer != -1ull) { struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu); - if (kvm_state->size < sizeof(kvm_state) + 2 * sizeof(*vmcs12)) + if (kvm_state->size < sizeof(*kvm_state) + 2 * sizeof(*vmcs12)) return -EINVAL; if (copy_from_user(shadow_vmcs12,
