netdev - Re: [PATCH v2] mac80211: LLVMLinux: Remove VLAIS usage from mac80211

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Date:	Fri, 07 Mar 2014 17:56:49 -0800
From:	Joe Perches <joe@...ches.com>
To:	behanw@...verseincode.com
Cc:	linville@...driver.com, johannes@...solutions.net,
	davem@...emloft.net, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dwmw2@...radead.org, pageexec@...email.hu,
	Jan-Simon Möller <dl9pf@....de>,
	Vinícius Tinti <viniciustinti@...il.com>,
	Mark Charlebois <charlebm@...il.com>
Subject: Re: [PATCH v2] mac80211: LLVMLinux: Remove VLAIS usage from mac80211

On Fri, 2014-03-07 at 17:26 -0800, behanw@...verseincode.com wrote:
> From: Jan-Simon Möller <dl9pf@....de>
> 
> Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99
> compliant equivalent. This is the original VLAIS struct.
[]
> diff --git a/net/mac80211/aes_ccm.c b/net/mac80211/aes_ccm.c
[]
> @@ -23,12 +23,14 @@ void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
>  			       u8 *data, size_t data_len, u8 *mic)
>  {
>  	struct scatterlist assoc, pt, ct[2];
> -	struct {
> -		struct aead_request	req;
> -		u8			priv[crypto_aead_reqsize(tfm)];
> -	} aead_req;
>  
> -	memset(&aead_req, 0, sizeof(aead_req));
> +	char aead_req_data[sizeof(struct aead_request) +
> +				crypto_aead_reqsize(tfm) +
> +				CRYPTO_MINALIGN] CRYPTO_MINALIGN_ATTR;

Can this be a too large amount of stack?

Is crypto_aead_reqsize() limited to < ~1k?

Perhaps it'd be better to use kzalloc for this
or another reserved pool


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