diff options
| author | Eric Biggers <ebiggers@google.com> | 2020-02-25 20:59:18 -0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-03-06 12:28:23 +1100 |
| commit | 959ac1cdd630b48fad3d8f47c96a01bfc3d71377 (patch) | |
| tree | 31212ed46f7037820004153203b68f0e03df61e2 /crypto/gcm.c | |
| parent | 3ff2bab82f42e05f39c77566f23ccbe5693f7982 (diff) | |
| download | lwn-959ac1cdd630b48fad3d8f47c96a01bfc3d71377.tar.gz lwn-959ac1cdd630b48fad3d8f47c96a01bfc3d71377.zip | |
crypto: gcm - simplify error handling in crypto_rfc4106_create()
Simplify the error handling in crypto_rfc4106_create() by taking
advantage of crypto_grab_aead() now handling an ERR_PTR() name and by
taking advantage of crypto_drop_aead() now accepting (as a no-op) a
spawn that hasn't been grabbed yet.
Conveniently, this eliminates the 'ccm_name' variable which was
incorrectly named (it should have been 'gcm_name').
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/gcm.c')
| -rw-r--r-- | crypto/gcm.c | 29 |
1 files changed, 9 insertions, 20 deletions
diff --git a/crypto/gcm.c b/crypto/gcm.c index 8e5c0ac65661..5560341e2810 100644 --- a/crypto/gcm.c +++ b/crypto/gcm.c @@ -840,7 +840,6 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl, struct aead_instance *inst; struct crypto_aead_spawn *spawn; struct aead_alg *alg; - const char *ccm_name; int err; algt = crypto_get_attr_type(tb); @@ -852,19 +851,15 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl, mask = crypto_requires_sync(algt->type, algt->mask); - ccm_name = crypto_attr_alg_name(tb[1]); - if (IS_ERR(ccm_name)) - return PTR_ERR(ccm_name); - inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); if (!inst) return -ENOMEM; spawn = aead_instance_ctx(inst); err = crypto_grab_aead(spawn, aead_crypto_instance(inst), - ccm_name, 0, mask); + crypto_attr_alg_name(tb[1]), 0, mask); if (err) - goto out_free_inst; + goto err_free_inst; alg = crypto_spawn_aead_alg(spawn); @@ -872,11 +867,11 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl, /* Underlying IV size must be 12. */ if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE) - goto out_drop_alg; + goto err_free_inst; /* Not a stream cipher? */ if (alg->base.cra_blocksize != 1) - goto out_drop_alg; + goto err_free_inst; err = -ENAMETOOLONG; if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, @@ -885,7 +880,7 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl, snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "rfc4106(%s)", alg->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) - goto out_drop_alg; + goto err_free_inst; inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; inst->alg.base.cra_priority = alg->base.cra_priority; @@ -909,17 +904,11 @@ static int crypto_rfc4106_create(struct crypto_template *tmpl, inst->free = crypto_rfc4106_free; err = aead_register_instance(tmpl, inst); - if (err) - goto out_drop_alg; - -out: + if (err) { +err_free_inst: + crypto_rfc4106_free(inst); + } return err; - -out_drop_alg: - crypto_drop_aead(spawn); -out_free_inst: - kfree(inst); - goto out; } static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key, |