virt: acrn: fix a memory leak in acrn_dev_ioctl()

The vm_param and cpu_regs need to be freed via kfree()
before return -EINVAL error.

Fixes: 9c5137ae ("virt: acrn: Introduce VM management interfaces")
Fixes: 2ad2aaee ("virt: acrn: Introduce an ioctl to set vCPU registers state")
Signed-off-by: Xiaolong Huang <butterflyhuangxx@gmail.com>
Signed-off-by: Fei Li <fei1.li@intel.com>
Link: https://lore.kernel.org/r/20220308092047.1008409-1-butterflyhuangxx@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/virt/acrn/hsm.c

@@ -136,8 +136,10 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
 		if (IS_ERR(vm_param))
 			return PTR_ERR(vm_param);
 
-		if ((vm_param->reserved0 | vm_param->reserved1) != 0)
+		if ((vm_param->reserved0 | vm_param->reserved1) != 0) {
+			kfree(vm_param);
 			return -EINVAL;
+		}
 
 		vm = acrn_vm_create(vm, vm_param);
 		if (!vm) {
@@ -182,21 +184,29 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
 			return PTR_ERR(cpu_regs);
 
 		for (i = 0; i < ARRAY_SIZE(cpu_regs->reserved); i++)
-			if (cpu_regs->reserved[i])
+			if (cpu_regs->reserved[i]) {
+				kfree(cpu_regs);
 				return -EINVAL;
+			}
 
 		for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_32); i++)
-			if (cpu_regs->vcpu_regs.reserved_32[i])
+			if (cpu_regs->vcpu_regs.reserved_32[i]) {
+				kfree(cpu_regs);
 				return -EINVAL;
+			}
 
 		for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.reserved_64); i++)
-			if (cpu_regs->vcpu_regs.reserved_64[i])
+			if (cpu_regs->vcpu_regs.reserved_64[i]) {
+				kfree(cpu_regs);
 				return -EINVAL;
+			}
 
 		for (i = 0; i < ARRAY_SIZE(cpu_regs->vcpu_regs.gdt.reserved); i++)
 			if (cpu_regs->vcpu_regs.gdt.reserved[i] |
-			    cpu_regs->vcpu_regs.idt.reserved[i])
+			    cpu_regs->vcpu_regs.idt.reserved[i]) {
+				kfree(cpu_regs);
 				return -EINVAL;
+			}
 
 		ret = hcall_set_vcpu_regs(vm->vmid, virt_to_phys(cpu_regs));
 		if (ret < 0)