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crypto: skcipher - pass instance to crypto_grab_skcipher()

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Initializing a crypto_skcipher_spawn currently requires:

1. Set spawn->base.inst to point to the instance.
2. Call crypto_grab_skcipher().

But there's no reason for these steps to be separate, and in fact this
unneeded complication has caused at least one bug, the one fixed by
commit 6db4341017 ("crypto: adiantum - initialize crypto_spawn::inst")

So just make crypto_grab_skcipher() take the instance as an argument.

To keep the function calls from getting too unwieldy due to this extra
argument, also introduce a 'mask' variable into the affected places
which weren't already using one.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers
2020-01-02 19:58:45 -08:00
committed by Herbert Xu
parent 77f7e94d72
commit b9f76dddb1
14 changed files with 68 additions and 71 deletions
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13
crypto/gcm.c
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@@ -580,6 +580,7 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
const char *ghash_name)
{
struct crypto_attr_type *algt;
u32 mask;
struct aead_instance *inst;
struct skcipher_alg *ctr;
struct crypto_alg *ghash_alg;
@@ -594,11 +595,11 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
return -EINVAL;
mask = crypto_requires_sync(algt->type, algt->mask);
ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
CRYPTO_ALG_TYPE_HASH,
CRYPTO_ALG_TYPE_AHASH_MASK |
crypto_requires_sync(algt->type,
algt->mask));
CRYPTO_ALG_TYPE_AHASH_MASK | mask);
if (IS_ERR(ghash_alg))
return PTR_ERR(ghash_alg);
@@ -620,10 +621,8 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
ghash->digestsize != 16)
goto err_drop_ghash;
crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
crypto_requires_sync(algt->type,
algt->mask));
err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
ctr_name, 0, mask);
if (err)
goto err_drop_ghash;