mac80211: LLVMLinux: Remove VLAIS usage from mac80211

Message ID 1394135570-26730-1-git-send-email-behanw@converseincode.com
State New
Headers show

Commit Message

Behan Webster March 6, 2014, 7:52 p.m.
From: Jan-Simon Möller <dl9pf@gmx.de>

Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99
compliant equivalent. This is the original VLAIS struct.

struct {
	struct aead_request     req;
	u8                      priv[crypto_aead_reqsize(tfm)];
} aead_req;

This patch instead allocates the appropriate amount of memory using an char
array.

The new code can be compiled with both gcc and clang.

Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com>
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
---
 net/mac80211/aes_ccm.c | 44 ++++++++++++++++++++++++++------------------
 1 file changed, 26 insertions(+), 18 deletions(-)

Comments

Johannes Berg March 7, 2014, 7:24 a.m. | #1
On Thu, 2014-03-06 at 11:52 -0800, behanw@converseincode.com wrote:
> From: Jan-Simon Möller <dl9pf@gmx.de>
> 
> Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99
> compliant equivalent.

Fine, but

> +	char aead_req_data[sizeof(struct aead_request)
> +				+ crypto_aead_reqsize(tfm)
> +				+ CRYPTO_MINALIGN] CRYPTO_MINALIGN_ATTR;

You really should be using kernel coding style, which changes
indentation and has the + on the previous line.

> +	struct aead_request *aead_req
> +		= (struct aead_request *) aead_req_data;

(void *) is perfectly find and it'll probably fit on one line then.

> +	memset(&aead_req_data, 0, (sizeof(struct aead_request)+
> +		crypto_aead_reqsize(tfm) + CRYPTO_MINALIGN));

You don't need the size calculation again, you can use
sizeof(aead_req_data)

johannes

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Patch hide | download patch | download mbox

diff --git a/net/mac80211/aes_ccm.c b/net/mac80211/aes_ccm.c
index 7c7df47..9612e95 100644
--- a/net/mac80211/aes_ccm.c
+++ b/net/mac80211/aes_ccm.c
@@ -23,12 +23,16 @@  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
+		= (struct aead_request *) aead_req_data;
+
+	memset(&aead_req_data, 0, (sizeof(struct aead_request)+
+		crypto_aead_reqsize(tfm) + CRYPTO_MINALIGN));
 
 	sg_init_one(&pt, data, data_len);
 	sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
@@ -36,23 +40,27 @@  void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
 	sg_set_buf(&ct[0], data, data_len);
 	sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
 
-	aead_request_set_tfm(&aead_req.req, tfm);
-	aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
-	aead_request_set_crypt(&aead_req.req, &pt, ct, data_len, b_0);
+	aead_request_set_tfm(aead_req, tfm);
+	aead_request_set_assoc(aead_req, &assoc, assoc.length);
+	aead_request_set_crypt(aead_req, &pt, ct, data_len, b_0);
 
-	crypto_aead_encrypt(&aead_req.req);
+	crypto_aead_encrypt(aead_req);
 }
 
 int ieee80211_aes_ccm_decrypt(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
+		= (struct aead_request *) aead_req_data;
+
+	memset(&aead_req_data, 0, (sizeof(struct aead_request)+
+		crypto_aead_reqsize(tfm) + CRYPTO_MINALIGN));
 
 	sg_init_one(&pt, data, data_len);
 	sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
@@ -60,12 +68,12 @@  int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
 	sg_set_buf(&ct[0], data, data_len);
 	sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
 
-	aead_request_set_tfm(&aead_req.req, tfm);
-	aead_request_set_assoc(&aead_req.req, &assoc, assoc.length);
-	aead_request_set_crypt(&aead_req.req, ct, &pt,
+	aead_request_set_tfm(aead_req, tfm);
+	aead_request_set_assoc(aead_req, &assoc, assoc.length);
+	aead_request_set_crypt(aead_req, ct, &pt,
 			       data_len + IEEE80211_CCMP_MIC_LEN, b_0);
 
-	return crypto_aead_decrypt(&aead_req.req);
+	return crypto_aead_decrypt(aead_req);
 }
 
 struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])