linux-kernel - Re: [PATCH] smack: Fix a memory leak in smack_add

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Date:   Fri, 21 Dec 2018 09:41:28 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     Al Viro <viro@...iv.linux.org.uk>,
        Dan Carpenter <dan.carpenter@...cle.com>
Cc:     James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] smack: Fix a memory leak in smack_add_opt()

On 12/21/2018 8:42 AM, Al Viro wrote:
> On Fri, Dec 21, 2018 at 04:36:54PM +0000, Al Viro wrote:
>> On Fri, Dec 21, 2018 at 12:09:58PM +0300, Dan Carpenter wrote:
>>> The function is leaking "opts" on the error paths.
>>>
>>> Fixes: 90e3b564ab93 ("smack: take the guts of smack_parse_opts_str() into a new helper")
>>> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>> D'oh...  Applied, thanks for spotting that braino.
> On the other hand, it's easier to do it this way - the caller will free the damn thing
> on error, anyway:

What tree/branch is the happening in?

>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 11da1e2531c8..cf0c0380e5dd 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -608,6 +608,7 @@ static int smack_add_opt(int token, const char *s, void **mnt_opts)
>  		opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
>  		if (!opts)
>  			return -ENOMEM;
> +		*mnt_opts = opts;
>  	}
>  	if (!s)
>  		return -ENOMEM;
> @@ -639,7 +640,6 @@ static int smack_add_opt(int token, const char *s, void **mnt_opts)
>  		opts->fstransmute = s;
>  		break;
>  	}
> -	*mnt_opts = opts;
>  	return 0;
>  
>  out_opt_err:
>