From mboxrd@z Thu Jan 1 00:00:00 1970 From: behanw@converseincode.com Subject: [PATCH] crypto: LLVMLinux: Remove VLAIS from crypto/ccp/ccp-crypto-sha.c Date: Fri, 5 Sep 2014 15:59:04 -0700 Message-ID: <1409957944-30173-1-git-send-email-behanw@converseincode.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.lendacky@amd.com, =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= , Behan Webster To: davem@davemloft.net, herbert@gondor.apana.org.au Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org =46rom: Jan-Simon M=C3=B6ller Replaced the use of a Variable Length Array In Struct (VLAIS) with a C9= 9 compliant equivalent. This patch allocates the appropriate amount of me= mory using an char array. The new code can be compiled with both gcc and clang. struct shash_desc contains a flexible array member member ctx declared = with CRYPTO_MINALIGN_ATTR, so sizeof(struct shash_desc) aligns the beginning of the array declared after struct shash_desc with long long. No trailing padding is required because it is not a struct type that ca= n be used in an array. The CRYPTO_MINALIGN_ATTR is required so that desc is aligned with long = long as would be the case for a struct containing a member with CRYPTO_MINALIGN_ATTR. Signed-off-by: Jan-Simon M=C3=B6ller Signed-off-by: Behan Webster --- drivers/crypto/ccp/ccp-crypto-sha.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/crypto/ccp/ccp-crypto-sha.c b/drivers/crypto/ccp/c= cp-crypto-sha.c index 873f234..29f9fda 100644 --- a/drivers/crypto/ccp/ccp-crypto-sha.c +++ b/drivers/crypto/ccp/ccp-crypto-sha.c @@ -198,10 +198,11 @@ static int ccp_sha_setkey(struct crypto_ahash *tf= m, const u8 *key, { struct ccp_ctx *ctx =3D crypto_tfm_ctx(crypto_ahash_tfm(tfm)); struct crypto_shash *shash =3D ctx->u.sha.hmac_tfm; - struct { - struct shash_desc sdesc; - char ctx[crypto_shash_descsize(shash)]; - } desc; + + char desc[sizeof(struct shash_desc) + + crypto_shash_descsize(shash)] CRYPTO_MINALIGN_ATTR; + struct shash_desc *sdesc =3D (struct shash_desc *)desc; + unsigned int block_size =3D crypto_shash_blocksize(shash); unsigned int digest_size =3D crypto_shash_digestsize(shash); int i, ret; @@ -216,11 +217,11 @@ static int ccp_sha_setkey(struct crypto_ahash *tf= m, const u8 *key, =20 if (key_len > block_size) { /* Must hash the input key */ - desc.sdesc.tfm =3D shash; - desc.sdesc.flags =3D crypto_ahash_get_flags(tfm) & + sdesc->tfm =3D shash; + sdesc->flags =3D crypto_ahash_get_flags(tfm) & CRYPTO_TFM_REQ_MAY_SLEEP; =20 - ret =3D crypto_shash_digest(&desc.sdesc, key, key_len, + ret =3D crypto_shash_digest(sdesc, key, key_len, ctx->u.sha.key); if (ret) { crypto_ahash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); --=20 1.9.1