diff --git a/fs/dax.c b/fs/dax.c
index a86d3cc..7b653e9 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -169,8 +169,10 @@
 		else
 			len = iov_iter_zero(max - pos, iter);
 
-		if (!len)
+		if (!len) {
+			retval = -EFAULT;
 			break;
+		}
 
 		pos += len;
 		addr += len;