KVM: x86/xen: Fix memory leak in kvm_xen_write_hypercall_page()

Release page irrespectively of kvm_vcpu_write_guest() return value.

Suggested-by: Paul Durrant <[email protected]>
Fixes: 23200b7 ("KVM: x86/xen: intercept xen hypercalls if enabled")
Signed-off-by: Michal Luczaj <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Paul Durrant <[email protected]>
Signed-off-by: David Woodhouse <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: mmhal

arch/x86/kvm/xen.c

@@ -1069,6 +1069,7 @@ int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
 		u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
 				  : kvm->arch.xen_hvm_config.blob_size_32;
 		u8 *page;
+		int ret;
 
 		if (page_num >= blob_size)
 			return 1;
@@ -1079,10 +1080,10 @@ int kvm_xen_write_hypercall_page(struct kvm_vcpu *vcpu, u64 data)
 		if (IS_ERR(page))
 			return PTR_ERR(page);
 
-		if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE)) {
-			kfree(page);
+		ret = kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE);
+		kfree(page);
+		if (ret)
 			return 1;
-		}
 	}
 	return 0;
 }