crypto: mcryptd - pass through absence of ->setkey()

BugLink: http://bugs.launchpad.net/bugs/1751064
commit fa59b92d299f2787e6bae1ff078ee0982e80211f upstream.

When the mcryptd template is used to wrap an unkeyed hash algorithm,
don't install a ->setkey() method to the mcryptd instance.  This change
is necessary for mcryptd to keep working with unkeyed hash algorithms
once we start enforcing that ->setkey() is called when present.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>

diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c
index eca04d3729b37c696c2dac4b0ac472422f30615d..6b4dd4b769426a4b2b9a2f9473c9fc8791312607 100644 (file)
--- a/crypto/mcryptd.c
+++ b/crypto/mcryptd.c
@@ -535,7 +535,8 @@ static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
        inst->alg.finup  = mcryptd_hash_finup_enqueue;
        inst->alg.export = mcryptd_hash_export;
        inst->alg.import = mcryptd_hash_import;
-       inst->alg.setkey = mcryptd_hash_setkey;
+       if (crypto_hash_alg_has_setkey(halg))
+               inst->alg.setkey = mcryptd_hash_setkey;
        inst->alg.digest = mcryptd_hash_digest_enqueue;
 
        err = ahash_register_instance(tmpl, inst);