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authorEric Biggers <ebiggers@google.com>2020-02-25 20:59:23 -0800
committerHerbert Xu <herbert@gondor.apana.org.au>2020-03-06 12:28:24 +1100
commit0708bb435354aede92819d44563d3113c7180cf0 (patch)
treebdb190201cdd972adf7d904a86d732f14ea15b42 /crypto
parent07b24c7c08bdc2d36de10881a17145426f47742b (diff)
downloadlinux-0708bb435354aede92819d44563d3113c7180cf0.tar.bz2
crypto: rsa-pkcs1pad - simplify error handling in pkcs1pad_create()
Simplify the error handling in pkcs1pad_create() by taking advantage of crypto_grab_akcipher() now handling an ERR_PTR() name and by taking advantage of crypto_drop_akcipher() now accepting (as a no-op) a spawn that hasn't been grabbed yet. While we're at it, also simplify the way the hash_name optional argument is handled. We only need to check whether it's present in one place, and we can just assign directly to ctx->digest_info. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/rsa-pkcs1pad.c59
1 files changed, 20 insertions, 39 deletions
diff --git a/crypto/rsa-pkcs1pad.c b/crypto/rsa-pkcs1pad.c
index 176b63afec8d..d31031de51bc 100644
--- a/crypto/rsa-pkcs1pad.c
+++ b/crypto/rsa-pkcs1pad.c
@@ -596,14 +596,11 @@ static void pkcs1pad_free(struct akcipher_instance *inst)
static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
{
- const struct rsa_asn1_template *digest_info;
struct crypto_attr_type *algt;
u32 mask;
struct akcipher_instance *inst;
struct pkcs1pad_inst_ctx *ctx;
- struct crypto_akcipher_spawn *spawn;
struct akcipher_alg *rsa_alg;
- const char *rsa_alg_name;
const char *hash_name;
int err;
@@ -616,60 +613,49 @@ static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
mask = crypto_requires_sync(algt->type, algt->mask);
- rsa_alg_name = crypto_attr_alg_name(tb[1]);
- if (IS_ERR(rsa_alg_name))
- return PTR_ERR(rsa_alg_name);
-
- hash_name = crypto_attr_alg_name(tb[2]);
- if (IS_ERR(hash_name))
- hash_name = NULL;
-
- if (hash_name) {
- digest_info = rsa_lookup_asn1(hash_name);
- if (!digest_info)
- return -EINVAL;
- } else
- digest_info = NULL;
-
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
if (!inst)
return -ENOMEM;
ctx = akcipher_instance_ctx(inst);
- spawn = &ctx->spawn;
- ctx->digest_info = digest_info;
- err = crypto_grab_akcipher(spawn, akcipher_crypto_instance(inst),
- rsa_alg_name, 0, mask);
+ err = crypto_grab_akcipher(&ctx->spawn, akcipher_crypto_instance(inst),
+ crypto_attr_alg_name(tb[1]), 0, mask);
if (err)
- goto out_free_inst;
+ goto err_free_inst;
- rsa_alg = crypto_spawn_akcipher_alg(spawn);
+ rsa_alg = crypto_spawn_akcipher_alg(&ctx->spawn);
err = -ENAMETOOLONG;
-
- if (!hash_name) {
+ hash_name = crypto_attr_alg_name(tb[2]);
+ if (IS_ERR(hash_name)) {
if (snprintf(inst->alg.base.cra_name,
CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
rsa_alg->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
- goto out_drop_alg;
+ goto err_free_inst;
if (snprintf(inst->alg.base.cra_driver_name,
CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s)",
rsa_alg->base.cra_driver_name) >=
CRYPTO_MAX_ALG_NAME)
- goto out_drop_alg;
+ goto err_free_inst;
} else {
+ ctx->digest_info = rsa_lookup_asn1(hash_name);
+ if (!ctx->digest_info) {
+ err = -EINVAL;
+ goto err_free_inst;
+ }
+
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
"pkcs1pad(%s,%s)", rsa_alg->base.cra_name,
hash_name) >= CRYPTO_MAX_ALG_NAME)
- goto out_drop_alg;
+ goto err_free_inst;
if (snprintf(inst->alg.base.cra_driver_name,
CRYPTO_MAX_ALG_NAME, "pkcs1pad(%s,%s)",
rsa_alg->base.cra_driver_name,
hash_name) >= CRYPTO_MAX_ALG_NAME)
- goto out_drop_alg;
+ goto err_free_inst;
}
inst->alg.base.cra_flags = rsa_alg->base.cra_flags & CRYPTO_ALG_ASYNC;
@@ -691,15 +677,10 @@ static int pkcs1pad_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->free = pkcs1pad_free;
err = akcipher_register_instance(tmpl, inst);
- if (err)
- goto out_drop_alg;
-
- return 0;
-
-out_drop_alg:
- crypto_drop_akcipher(spawn);
-out_free_inst:
- kfree(inst);
+ if (err) {
+err_free_inst:
+ pkcs1pad_free(inst);
+ }
return err;
}