From: Philipp Stephani <phst@google.com>
Date: Sun, 2 Aug 2020 10:58:44 +0000 (+0200)
Subject: * src/alloc.c (mark_memory): Avoid signed integer overflow
X-Git-Tag: emacs-28.0.90~6866
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=069b58b7c852b59f8ef7642e21db339626045671;p=emacs.git

* src/alloc.c (mark_memory): Avoid signed integer overflow
---

diff --git a/src/alloc.c b/src/alloc.c
index e139d8cf262..be293cca54a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -4861,7 +4861,7 @@ mark_memory (void const *start, void const *end)
 	 On a host with 32-bit pointers and 64-bit Lisp_Objects,
 	 a Lisp_Object might be split into registers saved into
 	 non-adjacent words and P might be the low-order word's value.  */
-      p = (char *) ((intptr_t) p + (intptr_t) lispsym);
+      p = (char *) ((uintptr_t) p + (uintptr_t) lispsym);
       mark_maybe_pointer (p);
 
       verify (alignof (Lisp_Object) % GC_POINTER_ALIGNMENT == 0);