diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index 2073b29ff969..7ecd70efdfea 100644
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -1413,8 +1413,19 @@ static loff_t cifs_remap_file_range(struct file *src_file, loff_t off,
 	 */
 	lock_two_nondirectories(target_inode, src_inode);
 
-	if (len == 0)
-		len = src_inode->i_size - off;
+	if (len == 0) {
+		loff_t src_size = i_size_read(src_inode);
+
+		if (off > src_size) {
+			rc = -EINVAL;
+			goto unlock;
+		}
+		len = src_size - off;
+		if (!len) {
+			rc = 0;
+			goto unlock;
+		}
+	}
 
 	cifs_dbg(FYI, "clone range\n");