From: Eric Biggers <ebiggers@xxxxxxxxxx>
Make the hmac template use the new function crypto_grab_shash() to
initialize its shash spawn.
This is needed to make all spawns be initialized in a consistent way.
This required making hmac_create() allocate the instance directly rather
than use shash_alloc_instance().
Also simplify the error handling by taking advantage of crypto_drop_*()
now accepting (as a no-op) spawns that haven't been initialized yet, and
by taking advantage of crypto_grab_*() now handling ERR_PTR() names.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
crypto/hmac.c | 36 +++++++++++++++++-------------------
1 file changed, 17 insertions(+), 19 deletions(-)
diff --git a/crypto/hmac.c b/crypto/hmac.c
index 685e49953605..1e6b175ce361 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -165,6 +165,7 @@ static void hmac_exit_tfm(struct crypto_shash *parent)
static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct shash_instance *inst;
+ struct crypto_shash_spawn *spawn;
struct crypto_alg *alg;
struct shash_alg *salg;
int err;
@@ -175,31 +176,32 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
if (err)
return err;
- salg = shash_attr_alg(tb[1], 0, 0);
- if (IS_ERR(salg))
- return PTR_ERR(salg);
+ inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+ if (!inst)
+ return -ENOMEM;
+ spawn = shash_instance_ctx(inst);
+
+ err = crypto_grab_shash(spawn, shash_crypto_instance(inst),
+ crypto_attr_alg_name(tb[1]), 0, 0);
+ if (err)
+ goto out;
+ salg = crypto_spawn_shash_alg(spawn);
alg = &salg->base;
/* The underlying hash algorithm must not require a key */
err = -EINVAL;
if (crypto_shash_alg_needs_key(salg))
- goto out_put_alg;
+ goto out;
ds = salg->digestsize;
ss = salg->statesize;
if (ds > alg->cra_blocksize ||
ss < alg->cra_blocksize)
- goto out_put_alg;
-
- inst = shash_alloc_instance("hmac", alg);
- err = PTR_ERR(inst);
- if (IS_ERR(inst))
- goto out_put_alg;
+ goto out;
- err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg,
- shash_crypto_instance(inst));
+ err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
if (err)
- goto out_free_inst;
+ goto out;
inst->alg.base.cra_priority = alg->cra_priority;
inst->alg.base.cra_blocksize = alg->cra_blocksize;
@@ -223,13 +225,9 @@ static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.exit_tfm = hmac_exit_tfm;
err = shash_register_instance(tmpl, inst);
- if (err) {
-out_free_inst:
+out:
+ if (err)
shash_free_instance(shash_crypto_instance(inst));
- }
-
-out_put_alg:
- crypto_mod_put(alg);
return err;
}
--
2.24.1
