[PATCH AUTOSEL 5.6 61/62] crypto: xts - simplify error handling in ->create()

[Sasha Levin]

From: Eric Biggers <ebigg...@google.com>

[ Upstream commit 732e540953477083082e999ff553622c59cffd5f ]

Simplify the error handling in the XTS template's ->create() function by
taking advantage of crypto_drop_skcipher() now accepting (as a no-op) a
spawn that hasn't been grabbed yet.

Signed-off-by: Eric Biggers <ebigg...@google.com>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 crypto/xts.c | 28 +++++++++++-----------------
 1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/crypto/xts.c b/crypto/xts.c
index 29efa15f14954..dbdd8af629e69 100644
--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -379,15 +379,15 @@ static int create(struct crypto_template *tmpl, struct 
rtattr **tb)
 
        err = -EINVAL;
        if (alg->base.cra_blocksize != XTS_BLOCK_SIZE)
-               goto err_drop_spawn;
+               goto err_free_inst;
 
        if (crypto_skcipher_alg_ivsize(alg))
-               goto err_drop_spawn;
+               goto err_free_inst;
 
        err = crypto_inst_setname(skcipher_crypto_instance(inst), "xts",
                                  &alg->base);
        if (err)
-               goto err_drop_spawn;
+               goto err_free_inst;
 
        err = -EINVAL;
        cipher_name = alg->base.cra_name;
@@ -400,20 +400,20 @@ static int create(struct crypto_template *tmpl, struct 
rtattr **tb)
 
                len = strlcpy(ctx->name, cipher_name + 4, sizeof(ctx->name));
                if (len < 2 || len >= sizeof(ctx->name))
-                       goto err_drop_spawn;
+                       goto err_free_inst;
 
                if (ctx->name[len - 1] != ')')
-                       goto err_drop_spawn;
+                       goto err_free_inst;
 
                ctx->name[len - 1] = 0;
 
                if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
                             "xts(%s)", ctx->name) >= CRYPTO_MAX_ALG_NAME) {
                        err = -ENAMETOOLONG;
-                       goto err_drop_spawn;
+                       goto err_free_inst;
                }
        } else
-               goto err_drop_spawn;
+               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;
@@ -437,17 +437,11 @@ static int create(struct crypto_template *tmpl, struct 
rtattr **tb)
        inst->free = free;
 
        err = skcipher_register_instance(tmpl, inst);
-       if (err)
-               goto err_drop_spawn;
-
-out:
-       return err;
-
-err_drop_spawn:
-       crypto_drop_skcipher(&ctx->spawn);
+       if (err) {
 err_free_inst:
-       kfree(inst);
-       goto out;
+               free(inst);
+       }
+       return err;
 }
 
 static struct crypto_template crypto_tmpl = {
-- 
2.20.1