linux-kernel - Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has 2 or more AUDIT

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Date:	Wed, 10 Apr 2013 18:18:34 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Al Viro <viro@...iv.linux.org.uk>, eparis@...hat.com
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has
 2 or more AUDIT_FILTERKEYs



in another function: audit_data_to_entry:

  a. has the same issue for case AUDIT_WATCH.

  b. has an new issue for AUDIT_DIR:
       after AUDIT_DIR succeed, it will set rule->tree.
       next, the other case fail, then will call audit_free_rule.
       but audit_free_rule will not free rule->tree.


  I find them only by reading code, not test them.
  and I also do not know about the related features.
  so please help check my 2 opinions whether are correct.


  welcome any suggestion or completions.

  thanks.

  :-)


gchen.


On 2013年04月10日 17:52, Chen Gang wrote:
> 
>   in the 'fcount' looping,
>     if 'new->fields[*].type" has 2 or more AUDIT_FILTERKEYs
>     need judge new->filterkey whether has value, or memory leak.
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/auditfilter.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
> index f9fc54b..936ac79 100644
> --- a/kernel/auditfilter.c
> +++ b/kernel/auditfilter.c
> @@ -859,6 +859,8 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old)
>  						       &old->fields[i]);
>  			break;
>  		case AUDIT_FILTERKEY:
> +			if (new->filterkey)
> +				break;
>  			fk = kstrdup(old->filterkey, GFP_KERNEL);
>  			if (unlikely(!fk))
>  				err = -ENOMEM;
> 


-- 
Chen Gang

Asianux Corporation
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