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 16:08:55 -0400 (EDT)
From:	Eric Paris <eparis@...hat.com>
To:	Chen Gang <gang.chen@...anux.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel: auditfilter: looping issue, memory leak if has
 2 or more AUDIT_FILTERKEYs

We only allow one filter key per rule.  So we should never be able to get into this situation.  See audit_data_to_entry()

-Eric

----- Original Message -----
> 
>   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;
> --
> 1.7.7.6
> 
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