crypto: shash - Fix module refcount

Module reference counting for shash is incorrect: when
a new shash transformation is created the refcount is not
increased as it should.

Signed-off-by: Adrian-Ken Rueegsegger <rueegsegger@swiss-it.ch>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/shash.c b/crypto/shash.c
index c9df367..d5a2b61 100644 (file)
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -388,10 +388,15 @@ static int crypto_init_shash_ops_compat(struct crypto_tfm *tfm)
        struct shash_desc *desc = crypto_tfm_ctx(tfm);
        struct crypto_shash *shash;
 
+       if (!crypto_mod_get(calg))
+               return -EAGAIN;
+
        shash = __crypto_shash_cast(crypto_create_tfm(
                calg, &crypto_shash_type));
-       if (IS_ERR(shash))
+       if (IS_ERR(shash)) {
+               crypto_mod_put(calg);
                return PTR_ERR(shash);
+       }
 
        desc->tfm = shash;
        tfm->exit = crypto_exit_shash_ops_compat;