- size_t pad_len = ctx->key_size - req_ctx->child_req.dst_len;
- size_t chunk_len, pad_left;
- struct sg_mapping_iter miter;
-
- if (!err) {
- if (pad_len) {
- sg_miter_start(&miter, req->dst,
- sg_nents_for_len(req->dst, pad_len),
- SG_MITER_ATOMIC | SG_MITER_TO_SG);
-
- pad_left = pad_len;
- while (pad_left) {
- sg_miter_next(&miter);
-
- chunk_len = min(miter.length, pad_left);
- memset(miter.addr, 0, chunk_len);
- pad_left -= chunk_len;
- }
-
- sg_miter_stop(&miter);
- }
-
- sg_pcopy_from_buffer(req->dst,
- sg_nents_for_len(req->dst, ctx->key_size),
- req_ctx->out_buf, req_ctx->child_req.dst_len,
- pad_len);
- }
+ unsigned int pad_len;
+ unsigned int len;
+ u8 *out_buf;
+
+ if (err)
+ goto out;
+
+ len = req_ctx->child_req.dst_len;
+ pad_len = ctx->key_size - len;
+
+ /* Four billion to one */
+ if (likely(!pad_len))
+ goto out;
+
+ out_buf = kzalloc(ctx->key_size, GFP_ATOMIC);
+ err = -ENOMEM;
+ if (!out_buf)
+ goto out;
+
+ sg_copy_to_buffer(req->dst, sg_nents_for_len(req->dst, len),
+ out_buf + pad_len, len);
+ sg_copy_from_buffer(req->dst,
+ sg_nents_for_len(req->dst, ctx->key_size),
+ out_buf, ctx->key_size);
+ kzfree(out_buf);
+
+out: