crypto: api - Fix zeroing on free

Geert Uytterhoeven pointed out that we're not zeroing all the
memory when freeing a transform.  This patch fixes it by calling
ksize to ensure that we zero everything in sight.

Reported-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 1 deletions

diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 3bacd71509fb..1f2e9020acc6 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -552,7 +552,12 @@ struct crypto_tfm *crypto_alloc_tfm(const char *alg_name,
                                     const struct crypto_type *frontend,
                                     u32 type, u32 mask);
 struct crypto_tfm *crypto_alloc_base(const char *alg_name, u32 type, u32 mask);
-void crypto_free_tfm(struct crypto_tfm *tfm);
+void crypto_destroy_tfm(void *mem, struct crypto_tfm *tfm);
+
+static inline void crypto_free_tfm(struct crypto_tfm *tfm)
+{
+        return crypto_destroy_tfm(tfm, tfm);
+}
 
 int alg_test(const char *driver, const char *alg, u32 type, u32 mask);