From: Noam Postavsky <npostavs@gmail.com>
Date: Sun, 3 Jul 2016 00:26:35 +0000 (-0400)
Subject: Error if --eval arg has text beyond 1 expression
X-Git-Tag: emacs-26.0.90~1780
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=a90d5e6309c0306d931d398506b242c3eb4f40d7;p=emacs.git

Error if --eval arg has text beyond 1 expression

* lisp/startup.el (command-line-1): If --eval argument has more data
than constitutes a single Lisp expression, signal an error (Bug #23159).
---

diff --git a/lisp/startup.el b/lisp/startup.el
index 761e69e03b1..fcdc376c5ff 100644
--- a/lisp/startup.el
+++ b/lisp/startup.el
@@ -2360,7 +2360,14 @@ nil default-directory" name)
 
                     ((member argi '("-eval" "-execute"))
                      (setq inhibit-startup-screen t)
-                     (eval (read (or argval (pop command-line-args-left)))))
+                     (let* ((str-expr (or argval (pop command-line-args-left)))
+                            (read-data (read-from-string str-expr))
+                            (expr (car read-data))
+                            (end (cdr read-data)))
+                       (unless (= end (length str-expr))
+                         (error "Trailing garbage following expression: %s"
+                                (substring str-expr end)))
+                       (eval expr)))
 
                     ((member argi '("-L" "-directory"))
                      ;; -L :/foo adds /foo to the _end_ of load-path.