linux-ext4 - Re: [PATCH 03/12] zap_sector: fix memory leak

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Date:   Mon, 24 May 2021 17:40:59 +0300
From:   Благодаренко Артём 
        <artem.blagodarenko@...il.com>
To:     Wu Guanghao <wuguanghao3@...wei.com>
Cc:     linux-ext4@...r.kernel.org, liuzhiqiang26@...wei.com,
        linfeilong@...wei.com
Subject: Re: [PATCH 03/12] zap_sector: fix memory leak

Hello Wu,

Thank you for the fixes.

It looks like free and return operators should be placed in {} block.

{
	free(buf);
 	return;
}

Now function returns any time block is read successfully.

Also, this patch can not be applied cleanly to the master HEAD because of wrong offsets. Please rebase.

Best regards,
Artem Blagodarenko.

> On 24 May 2021, at 14:20, Wu Guanghao <wuguanghao3@...wei.com> wrote:
> 
> In zap_sector(), need free buf before return,
> otherwise it will cause memory leak.
> 
> Signed-off-by: Wu Guanghao <wuguanghao3@...wei.com>
> Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
> Reviewed-by: Wu Bo <wubo40@...wei.com>
> ---
> misc/mke2fs.c | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/misc/mke2fs.c b/misc/mke2fs.c
> index afbcf486..94f81da9 100644
> --- a/misc/mke2fs.c
> +++ b/misc/mke2fs.c
> @@ -586,6 +586,7 @@ static void zap_sector(ext2_filsys fs, int sect, int nsect)
> 			magic = (unsigned int *) (buf + BSD_LABEL_OFFSET);
> 			if ((*magic == BSD_DISKMAGIC) ||
> 				(*magic == BSD_MAGICDISK))
> +				free(buf);
> 				return;
> 		}
> 	}
> --