crypto: adiantum - fix leaking reference to hash algorithm

crypto_alg_mod_lookup() takes a reference to the hash algorithm but
crypto_init_shash_spawn() doesn't take ownership of it, hence the
reference needs to be dropped in adiantum_create().

Fixes: 059c2a4d8e16 ("crypto: adiantum - add Adiantum support")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 5 insertions, 4 deletions

diff --git a/crypto/adiantum.c b/crypto/adiantum.c
index e62e34f5e389..6651e713c45d 100644
--- a/crypto/adiantum.c
+++ b/crypto/adiantum.c
@@ -564,10 +564,8 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
         hash_alg = __crypto_shash_alg(_hash_alg);
         err = crypto_init_shash_spawn(&ictx->hash_spawn, hash_alg,
                                       skcipher_crypto_instance(inst));
-        if (err) {
-                crypto_mod_put(_hash_alg);
-                goto out_drop_blockcipher;
-        }
+        if (err)
+                goto out_put_hash;
 
         /* Check the set of algorithms */
         if (!adiantum_supported_algorithms(streamcipher_alg, blockcipher_alg,
@@ -624,10 +622,13 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
         if (err)
                 goto out_drop_hash;
 
+        crypto_mod_put(_hash_alg);
         return 0;
 
 out_drop_hash:
         crypto_drop_shash(&ictx->hash_spawn);
+out_put_hash:
+        crypto_mod_put(_hash_alg);
 out_drop_blockcipher:
         crypto_drop_spawn(&ictx->blockcipher_spawn);
 out_drop_streamcipher: