From 1d0459cd83f5426d668ec3304a35f9dbeee6296b Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Thu, 2 Jan 2020 19:59:02 -0800 Subject: [PATCH] crypto: cmac - use crypto_grab_cipher() and simplify error paths Make the cmac template use the new function crypto_grab_cipher() to initialize its cipher spawn. This is needed to make all spawns be initialized in a consistent way. This required making cmac_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 Signed-off-by: Herbert Xu --- crypto/cmac.c | 33 +++++++++++++++------------------ 1 file changed, 15 insertions(+), 18 deletions(-) diff --git a/crypto/cmac.c b/crypto/cmac.c index 0928aebc6205..c6bf78b5321a 100644 --- a/crypto/cmac.c +++ b/crypto/cmac.c @@ -222,6 +222,7 @@ static void cmac_exit_tfm(struct crypto_tfm *tfm) static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb) { struct shash_instance *inst; + struct crypto_cipher_spawn *spawn; struct crypto_alg *alg; unsigned long alignmask; int err; @@ -230,10 +231,16 @@ static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb) if (err) return err; - alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, - CRYPTO_ALG_TYPE_MASK); - if (IS_ERR(alg)) - return PTR_ERR(alg); + inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); + if (!inst) + return -ENOMEM; + spawn = shash_instance_ctx(inst); + + err = crypto_grab_cipher(spawn, shash_crypto_instance(inst), + crypto_attr_alg_name(tb[1]), 0, 0); + if (err) + goto err_free_inst; + alg = crypto_spawn_cipher_alg(spawn); switch (alg->cra_blocksize) { case 16: @@ -241,19 +248,12 @@ static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb) break; default: err = -EINVAL; - goto out_put_alg; + goto err_free_inst; } - inst = shash_alloc_instance("cmac", alg); - err = PTR_ERR(inst); - if (IS_ERR(inst)) - goto out_put_alg; - - err = crypto_init_spawn(shash_instance_ctx(inst), alg, - shash_crypto_instance(inst), - CRYPTO_ALG_TYPE_MASK); + err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg); if (err) - goto out_free_inst; + goto err_free_inst; alignmask = alg->cra_alignmask; inst->alg.base.cra_alignmask = alignmask; @@ -282,12 +282,9 @@ static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb) err = shash_register_instance(tmpl, inst); if (err) { -out_free_inst: +err_free_inst: shash_free_instance(shash_crypto_instance(inst)); } - -out_put_alg: - crypto_mod_put(alg); return err; }