crypto: hash - Fixed digest size check

The digest size check on hash algorithms is incorrect.  It's
perfectly valid for hash algorithms to have a digest length
longer than their block size.  For example crc32c has a block
size of 1 and a digest size of 4.  Rather than having it lie
about its block size, this patch fixes the checks to do what
they really should which is to bound the digest size so that
code placing the digest on the stack continue to work.

HMAC however still needs to check this as it's only defined
for such algorithms.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 1 insertions, 1 deletions

diff --git a/crypto/hash.c b/crypto/hash.c
index f9400a014e74..0d7caa9ab748 100644
--- a/crypto/hash.c
+++ b/crypto/hash.c
@@ -152,7 +152,7 @@ static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
 {
         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
 
-        if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
+        if (alg->digestsize > PAGE_SIZE / 8)
                 return -EINVAL;
 
         if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)