Commit b04940e2 authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Greg Kroah-Hartman

kvm: fix page struct leak in handle_vmon

commit 06ce521a upstream.

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: default avatarDmitry Vyukov <dvyukov@google.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Cc: "Charles (Chas) Williams" <ciwillia@brocade.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent af729160
...@@ -7086,13 +7086,18 @@ static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason, ...@@ -7086,13 +7086,18 @@ static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason,
} }
page = nested_get_page(vcpu, vmptr); page = nested_get_page(vcpu, vmptr);
if (page == NULL || if (page == NULL) {
*(u32 *)kmap(page) != VMCS12_REVISION) {
nested_vmx_failInvalid(vcpu); nested_vmx_failInvalid(vcpu);
return kvm_skip_emulated_instruction(vcpu);
}
if (*(u32 *)kmap(page) != VMCS12_REVISION) {
kunmap(page); kunmap(page);
nested_release_page_clean(page);
nested_vmx_failInvalid(vcpu);
return kvm_skip_emulated_instruction(vcpu); return kvm_skip_emulated_instruction(vcpu);
} }
kunmap(page); kunmap(page);
nested_release_page_clean(page);
vmx->nested.vmxon_ptr = vmptr; vmx->nested.vmxon_ptr = vmptr;
break; break;
case EXIT_REASON_VMCLEAR: case EXIT_REASON_VMCLEAR:
......
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