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

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Date:	Sat, 8 Mar 2014 21:29:57 +0100
From:	Sergei Antonov <saproj@...il.com>
To:	behanw@...verseincode.com
Cc:	linville@...driver.com, johannes@...solutions.net,
	davem@...emloft.net,
	linux-wireless <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 8 March 2014 02:26,  <behanw@...verseincode.com> wrote:
> diff --git a/net/mac80211/aes_ccm.c b/net/mac80211/aes_ccm.c
> index 7c7df47..3317578 100644
> --- 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;
> +
> +       struct aead_request *aead_req = (void *) aead_req_data;

Bad trick with regards to alignment.
The alignment requirement for struct aead_request is stronger than
what an array of chars may have.
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