42 lines
1.3 KiB
Diff
42 lines
1.3 KiB
Diff
|
Subject: [PATCH] kvm: fix page struct leak in handle_vmon
|
||
|
|
From: Paolo Bonzini <pbonzini () redhat ! com>
|
||
|
|
Date: 2017-01-24 10:56:21
|
||
|
|
|
||
|
|
handle_vmon gets a reference on VMXON region page,
|
||
|
|
but does not release it. Release the reference.
|
||
|
|
|
||
|
|
Found by syzkaller; based on a patch by Dmitry.
|
||
|
|
|
||
|
|
Reported-by: Dmitry Vyukov <dvyukov@google.com>
|
||
|
|
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
|
||
|
|
Reviewed-by: David Hildenbrand <david@redhat.com>
|
||
|
|
---
|
||
|
|
arch/x86/kvm/vmx.c | 9 +++++++--
|
||
|
|
1 file changed, 7 insertions(+), 2 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
|
||
|
|
index 42cc3d6f4d20..0f7345035210 100644
|
||
|
|
--- a/arch/x86/kvm/vmx.c
|
||
|
|
+++ b/arch/x86/kvm/vmx.c
|
||
|
|
@@ -7085,13 +7085,18 @@ static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason,
|
||
|
|
}
|
||
|
|
|
||
|
|
page = nested_get_page(vcpu, vmptr);
|
||
|
|
- if (page == NULL ||
|
||
|
|
- *(u32 *)kmap(page) != VMCS12_REVISION) {
|
||
|
|
+ if (page == NULL) {
|
||
|
|
nested_vmx_failInvalid(vcpu);
|
||
|
|
+ return kvm_skip_emulated_instruction(vcpu);
|
||
|
|
+ }
|
||
|
|
+ if (*(u32 *)kmap(page) != VMCS12_REVISION) {
|
||
|
|
kunmap(page);
|
||
|
|
+ nested_release_page_clean(page);
|
||
|
|
+ nested_vmx_failInvalid(vcpu);
|
||
|
|
return kvm_skip_emulated_instruction(vcpu);
|
||
|
|
}
|
||
|
|
kunmap(page);
|
||
|
|
+ nested_release_page_clean(page);
|
||
|
|
vmx->nested.vmxon_ptr = vmptr;
|
||
|
|
break;
|
||
|
|
case EXIT_REASON_VMCLEAR:
|