linux-kernel - Re: [PATCH] Fix a memory leak in the function lpss8250

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Message-ID: <79a30533-7504-9a53-8f8a-ca16817c1ee5@linux.intel.com>
Date: Fri, 26 Apr 2024 13:51:40 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: lumingyindetect@....com
cc: LKML <linux-kernel@...r.kernel.org>, 
    linux-serial <linux-serial@...r.kernel.org>, 
    Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
    Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    Jiri Slaby <jirislaby@...nel.org>, 
    LuMingYin <11570291+yin-luming@...r.noreply.gitee.com>
Subject: Re: [PATCH] Fix a memory leak in the function lpss8250_probe

On Fri, 26 Apr 2024, lumingyindetect@....com wrote:

> From: LuMingYin <11570291+yin-luming@...r.noreply.gitee.com>
> 
> In the lpss8250_probe function in the 8250_lpss.c file, the program may directly return at either line 347 or line 351, without jumping to the error handling label to release the dynamically allocated memory region pointed to by the variable pdev, as done at line 357 or line 361. This fix introduces a new label named free_irq_vectors to release the dynamically allocated memory region pointed to by pdev, thereby fixing the memory leak defect.

Hi,

You left most of my comments unaddressed. :-( Please don't send a new 
version unless you've addressed all the comments.

> Signed-off-by: LuMingYin <11570291+yin-luming@...r.noreply.gitee.com>
> ---

You also need to name version of the patch on subject line and provide the 
version history here underneath --- line.

>  drivers/tty/serial/8250/8250_lpss.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/serial/8250/8250_lpss.c b/drivers/tty/serial/8250/8250_lpss.c
> index c3cd6cb9ac80..fa9fd4dc86c7 100644
> --- a/drivers/tty/serial/8250/8250_lpss.c
> +++ b/drivers/tty/serial/8250/8250_lpss.c
> @@ -344,11 +344,11 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	uart.port.mapbase = pci_resource_start(pdev, 0);
>  	uart.port.membase = pcim_iomap(pdev, 0, 0);
>  	if (!uart.port.membase)
> -		return -ENOMEM;
> +		goto free_irq_vectors;
>  
>  	ret = lpss->board->setup(lpss, &uart.port);
>  	if (ret)
> -		return ret;
> +		goto free_irq_vectors;
>  
>  	dw8250_setup_port(&uart.port);
>  
> @@ -367,6 +367,7 @@ static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  
>  err_exit:
>  	lpss->board->exit(lpss);
> +free_irq_vectors:
>  	pci_free_irq_vectors(pdev);
>  	return ret;
>  }
> 

-- 
 i.