diff --git a/fs/dax.c b/fs/dax.c
index a86d3cc2b38941b0e39f23be84e4986d8852ae42..7b653e9aa8d1cee30e2b157cc407f947675bda64 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -169,8 +169,10 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
 		else
 			len = iov_iter_zero(max - pos, iter);
 
-		if (!len)
+		if (!len) {
+			retval = -EFAULT;
 			break;
+		}
 
 		pos += len;
 		addr += len;