From: Sean Christopherson sean.j.christopherson@intel.com
commit d18b2f43b9147c8005ae0844fb445d8cc6a87e31 upstream.
Check the result of __vmalloc() to avoid dereferencing a NULL pointer in the event that allocation failres.
Fixes: d1e5b0e98ea27 ("kvm: Make VM ioctl do valloc for some archs") Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson sean.j.christopherson@intel.com Reviewed-by: Vitaly Kuznetsov vkuznets@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kvm/svm.c | 4 ++++ arch/x86/kvm/vmx.c | 4 ++++ 2 files changed, 8 insertions(+)
--- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1917,6 +1917,10 @@ static void __unregister_enc_region_lock static struct kvm *svm_vm_alloc(void) { struct kvm_svm *kvm_svm = vzalloc(sizeof(struct kvm_svm)); + + if (!kvm_svm) + return NULL; + return &kvm_svm->kvm; }
--- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -10986,6 +10986,10 @@ STACK_FRAME_NON_STANDARD(vmx_vcpu_run); static struct kvm *vmx_vm_alloc(void) { struct kvm_vmx *kvm_vmx = vzalloc(sizeof(struct kvm_vmx)); + + if (!kvm_vmx) + return NULL; + return &kvm_vmx->kvm; }