[PATCH 5.15 168/207] KVM: VMX: Set failure code in prepare_vmcs02()

Greg Kroah-Hartman
2021-12-06T15:53:40Z

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit bfbb307c628676929c2d329da0daf9d22afa8ad2 ]

The error paths in the prepare_vmcs02() function are supposed to set
*entry_failure_code but this path does not. It leads to using an
uninitialized variable in the caller.

Fixes: 71f7347025bf ("KVM: nVMX: Load GUEST_IA32_PERF_GLOBAL_CTRL MSR on VM-Entry")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Message-Id: <20211130125337.GB24578@kili>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kvm/vmx/nested.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 302f1752cc4c2..e97a11abc1d85 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2609,8 +2609,10 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,

if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) &&
WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
- vmcs12->guest_ia32_perf_global_ctrl)))
+ vmcs12->guest_ia32_perf_global_ctrl))) {
+ *entry_failure_code = ENTRY_FAIL_DEFAULT;
return -EINVAL;
+ }

kvm_rsp_write(vcpu, vmcs12->guest_rsp);
kvm_rip_write(vcpu, vmcs12->guest_rip);
--
2.33.0