crypto: LLVMLinux: Remove VLAIS from crypto/n2_core.c

Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99
compliant equivalent. This patch allocates the appropriate amount of memory
using a char array using the SHASH_DESC_ON_STACK macro.

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

Signed-off-by: Behan Webster <behanw@converseincode.com>
Reviewed-by: Mark Charlebois <charlebm@gmail.com>
Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 4 insertions, 7 deletions

diff --git a/drivers/crypto/n2_core.c b/drivers/crypto/n2_core.c
index 7263c10a56ee..f8e3207fecb1 100644
--- a/drivers/crypto/n2_core.c
+++ b/drivers/crypto/n2_core.c
@@ -445,10 +445,7 @@ static int n2_hmac_async_setkey(struct crypto_ahash *tfm, const u8 *key,
         struct n2_hmac_ctx *ctx = crypto_ahash_ctx(tfm);
         struct crypto_shash *child_shash = ctx->child_shash;
         struct crypto_ahash *fallback_tfm;
-        struct {
-                struct shash_desc shash;
-                char ctx[crypto_shash_descsize(child_shash)];
-        } desc;
+        SHASH_DESC_ON_STACK(shash, child_shash);
         int err, bs, ds;
 
         fallback_tfm = ctx->base.fallback_tfm;
@@ -456,15 +453,15 @@ static int n2_hmac_async_setkey(struct crypto_ahash *tfm, const u8 *key,
         if (err)
                 return err;
 
-        desc.shash.tfm = child_shash;
-        desc.shash.flags = crypto_ahash_get_flags(tfm) &
+        shash->tfm = child_shash;
+        shash->flags = crypto_ahash_get_flags(tfm) &
                 CRYPTO_TFM_REQ_MAY_SLEEP;
 
         bs = crypto_shash_blocksize(child_shash);
         ds = crypto_shash_digestsize(child_shash);
         BUG_ON(ds > N2_HASH_KEY_MAX);
         if (keylen > bs) {
-                err = crypto_shash_digest(&desc.shash, key, keylen,
+                err = crypto_shash_digest(shash, key, keylen,
                                           ctx->hash_key);
                 if (err)
                         return err;