linux-kernel - Re: [PATCH] kernel/module: Fix mem leak in module_add_modinfo

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Message-ID: <60ececa2-2741-c4e5-c028-35d95cbeb731@huawei.com>
Date:   Thu, 30 May 2019 17:24:22 +0800
From:   Yuehaibing <yuehaibing@...wei.com>
To:     <jeyu@...nel.org>, <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <paulmck@...ux.ibm.com>
Subject: Re: [PATCH] kernel/module: Fix mem leak in module_add_modinfo_attrs

Friendly ping...

On 2019/5/16 0:12, YueHaibing wrote:
> In module_add_modinfo_attrs if sysfs_create_file
> fails, we forget to free allocated modinfo_attrs
> and roll back the sysfs files.
> 
> Fixes: 03e88ae1b13d ("[PATCH] fix module sysfs files reference counting")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
>  kernel/module.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/module.c b/kernel/module.c
> index 0b9aa8a..7da73c4 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -1714,15 +1714,29 @@ static int module_add_modinfo_attrs(struct module *mod)
>  		return -ENOMEM;
>  
>  	temp_attr = mod->modinfo_attrs;
> -	for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
> +	for (i = 0; (attr = modinfo_attrs[i]); i++) {
>  		if (!attr->test || attr->test(mod)) {
>  			memcpy(temp_attr, attr, sizeof(*temp_attr));
>  			sysfs_attr_init(&temp_attr->attr);
>  			error = sysfs_create_file(&mod->mkobj.kobj,
>  					&temp_attr->attr);
> +			if (error)
> +				goto error_out;
>  			++temp_attr;
>  		}
>  	}
> +
> +	return 0;
> +
> +error_out:
> +	for (; (attr = &mod->modinfo_attrs[i]) && i >= 0; i--) {
> +		if (!attr->attr.name)
> +			break;
> +		sysfs_remove_file(&mod->mkobj.kobj, &attr->attr);
> +		if (attr->free)
> +			attr->free(mod);
> +	}
> +	kfree(mod->modinfo_attrs);
>  	return error;
>  }
>  
>