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Date:   Tue, 8 Mar 2022 10:56:08 +0100
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Xiaolong Huang <butterflyhuangxx@gmail.com>
Cc:     fei1.li@intel.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] virt: acrn: fix a memory leak in acrn_dev_ioctl()
Message-ID: <YicoOC+WZhNLq+pX@kroah.com>
References: <20220308092047.1008409-1-butterflyhuangxx@gmail.com>
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On Tue, Mar 08, 2022 at 05:20:47PM +0800, Xiaolong Huang wrote:
> The vm_param and cpu_regs need to be freed via kfree()
> before return -EINVAL error.
> 
> Fixes: 9c5137aedd11 ("virt: acrn: Introduce VM management interfaces")
> Fixes: 2ad2aaee1bc9 ("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>
> ---
>  drivers/virt/acrn/hsm.c | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c
> index 5419794fccf1..423ea888d79a 100644
> --- a/drivers/virt/acrn/hsm.c
> +++ b/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)
> 
> base-commit: 5859a2b1991101d6b978f3feb5325dad39421f29
> -- 
> 2.25.1
> 

How did you test this?