1 files changed, 23 insertions, 2 deletions

diff --git a/crypto/hmac.c b/crypto/hmac.c
index b60c3c7aa320..14c6351e639d 100644
--- a/crypto/hmac.c
+++ b/crypto/hmac.c
@@ -57,14 +57,35 @@ static int hmac_setkey(struct crypto_hash *parent,
         if (keylen > bs) {
                 struct hash_desc desc;
                 struct scatterlist tmp;
+                int tmplen;
                 int err;
 
                 desc.tfm = tfm;
                 desc.flags = crypto_hash_get_flags(parent);
                 desc.flags &= CRYPTO_TFM_REQ_MAY_SLEEP;
-                sg_init_one(&tmp, inkey, keylen);
 
-                err = crypto_hash_digest(&desc, &tmp, keylen, digest);
+                err = crypto_hash_init(&desc);
+                if (err)
+                        return err;
+
+                tmplen = bs * 2 + ds;
+                sg_init_one(&tmp, ipad, tmplen);
+
+                for (; keylen > tmplen; inkey += tmplen, keylen -= tmplen) {
+                        memcpy(ipad, inkey, tmplen);
+                        err = crypto_hash_update(&desc, &tmp, tmplen);
+                        if (err)
+                                return err;
+                }
+
+                if (keylen) {
+                        memcpy(ipad, inkey, keylen);
+                        err = crypto_hash_update(&desc, &tmp, keylen);
+                        if (err)
+                                return err;
+                }
+
+                err = crypto_hash_final(&desc, digest);
                 if (err)
                         return err;