[CRYPTO] Check cra_alignmask against cra_blocksize

The cipher code relies on the fact that the block size is a multiple
of the required alignment.  So we should check this at the time of
algorith registration.  We also ensure that the block size is bounded
by the page size.

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

1 files changed, 4 insertions, 1 deletions

diff --git a/crypto/api.c b/crypto/api.c
index 959c4e5f264f..40ae42e9b6a6 100644
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -215,7 +215,10 @@ int crypto_register_alg(struct crypto_alg *alg)
         if (alg->cra_alignmask & (alg->cra_alignmask + 1))
                 return -EINVAL;
 
-        if (alg->cra_alignmask > PAGE_SIZE)
+        if (alg->cra_alignmask & alg->cra_blocksize)
+                return -EINVAL;
+
+        if (alg->cra_blocksize > PAGE_SIZE)
                 return -EINVAL;
         
         down_write(&crypto_alg_sem);