crypto: gf128mul - Zero memory when freeing multiplication table

GF(2^128) multiplication tables are typically used for secret
information, so it's a good idea to zero them on free.
Signed-off-by: NAlex Cope <alexcope@google.com>
Signed-off-by: NEric Biggers <ebiggers@google.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

crypto/gf128mul.c

@@ -310,8 +310,8 @@ void gf128mul_free_64k(struct gf128mul_64k *t)
 	int i;
 
 	for (i = 0; i < 16; i++)
-		kfree(t->t[i]);
-	kfree(t);
+		kzfree(t->t[i]);
+	kzfree(t);
 }
 EXPORT_SYMBOL(gf128mul_free_64k);
 

include/crypto/gf128mul.h

@@ -177,7 +177,7 @@ void gf128mul_4k_bbe(be128 *a, struct gf128mul_4k *t);
 
 static inline void gf128mul_free_4k(struct gf128mul_4k *t)
 {
-	kfree(t);
+	kzfree(t);
 }