KVM: SVM: Fix memory leaks that happen when svm_create_vcpu() fails

(Cherry-picked from commit b7af40433870aa0636932ad39b0c48a0cb319057)

svm_create_vcpu() does not free the pages allocated during the creation
when it fails to complete the allocations. This patch fixes it.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 15 insertions, 10 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 1d9b33843c80..d42e191b17fa 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -698,29 +698,28 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
         if (err)
                 goto free_svm;
 
+        err = -ENOMEM;
         page = alloc_page(GFP_KERNEL);
-        if (!page) {
-                err = -ENOMEM;
+        if (!page)
                 goto uninit;
-        }
 
-        err = -ENOMEM;
         msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
         if (!msrpm_pages)
-                goto uninit;
+                goto free_page1;
 
         nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
         if (!nested_msrpm_pages)
-                goto uninit;
-
-        svm->msrpm = page_address(msrpm_pages);
-        svm_vcpu_init_msrpm(svm->msrpm);
+                goto free_page2;
 
         hsave_page = alloc_page(GFP_KERNEL);
         if (!hsave_page)
-                goto uninit;
+                goto free_page3;
+
         svm->nested.hsave = page_address(hsave_page);
 
+        svm->msrpm = page_address(msrpm_pages);
+        svm_vcpu_init_msrpm(svm->msrpm);
+
         svm->nested.msrpm = page_address(nested_msrpm_pages);
 
         svm->vmcb = page_address(page);
@@ -737,6 +736,12 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 
         return &svm->vcpu;
 
+free_page3:
+        __free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
+free_page2:
+        __free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
+free_page1:
+        __free_page(page);
 uninit:
         kvm_vcpu_uninit(&svm->vcpu);
 free_svm: