crypto: api - Include alignment in crypto_alg_extsize

This patch ensures that the tfm context always has enough extra
memory to ensure that it is aligned according to cra_alignment.

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

diff --git a/crypto/algapi.c b/crypto/algapi.c
index abf100c..3c079b7 100644 (file)
--- a/crypto/algapi.c
+++ b/crypto/algapi.c
@@ -980,7 +980,8 @@ EXPORT_SYMBOL_GPL(crypto_xor);
 
 unsigned int crypto_alg_extsize(struct crypto_alg *alg)
 {
-       return alg->cra_ctxsize;
+       return alg->cra_ctxsize +
+              (alg->cra_alignmask & ~(crypto_tfm_ctx_alignment() - 1));
 }
 EXPORT_SYMBOL_GPL(crypto_alg_extsize);