+static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
+{
+ unsigned ds;
+
+ if (ctx->result)
+ return 0;
+
+ ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
+
+ ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
+ if (!ctx->result)
+ return -ENOMEM;
+
+ memset(ctx->result, 0, ds);
+
+ return 0;
+}
+
+static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
+{
+ unsigned ds;
+
+ if (!ctx->result)
+ return;
+
+ ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
+
+ sock_kzfree_s(sk, ctx->result, ds);
+ ctx->result = NULL;
+}
+