diff --cc net/rds/info.c
index 499b3774860e,17061f6ff74e..21b32eb16559
--- a/net/rds/info.c
+++ b/net/rds/info.c
@@@ -239,16 -230,13 +239,16 @@@ call_func
  		ret = lens.each;
  	}
  
 -	if (put_user(len, optlen))
 -		ret = -EFAULT;
 +	opt->optlen = len;
  
  out:
 -	if (pages)
 +	/*
 +	 * iov_iter_extract_pages() pins only user-backed (ubuf) iters;
 +	 * iov_iter_extract_will_pin() reports whether an unpin is owed here.
 +	 */
 +	if (pages && iov_iter_extract_will_pin(&opt->iter_out))
- 		unpin_user_pages(pages, nr_pages);
+ 		unpin_user_pages_dirty_lock(pages, nr_pages, true);
 -	kfree(pages);
 +	kvfree(pages);
  
  	return ret;
  }