[CRYPTO] api: Require block size to be less than PAGE_SIZE/8

The cipher code path may allocate up to two blocks of data on the stack.
Therefore we need to place limits on the maximum block size.

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

diff --git a/crypto/api.c b/crypto/api.c
index 2715afdf678c19c7b908d01c76c3fbce1160a9df..e26156f718395393bc50883bc61edc7b2a7e2d22 100644 (file)
--- a/crypto/api.c
+++ b/crypto/api.c
@@ -251,7 +251,7 @@ int crypto_register_alg(struct crypto_alg *alg)
        if (alg->cra_alignmask & alg->cra_blocksize)
                return -EINVAL;
 
-       if (alg->cra_blocksize > PAGE_SIZE)
+       if (alg->cra_blocksize > PAGE_SIZE / 8)
                return -EINVAL;
 
        if (alg->cra_priority < 0)