[Emacs-diffs] master c26469d: Fix arithmetic overflow in GC consing count

[Paul Eggert]

branch: master
commit c26469daa752baf276bcad61b042b218402547de
Author: Paul Eggert <eggert@day>
Commit: Paul Eggert <address@hidden>

    Fix arithmetic overflow in GC consing count
    
    * src/alloc.c (allow_garbage_collection):
    Redo expression to avoid signed arithmetic overflow
    in an intermediate expression when CONSING is negative.
---
 src/alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/alloc.c b/src/alloc.c
index c17bdb7..5e08931 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -5498,7 +5498,7 @@ staticpro (Lisp_Object const *varaddress)
 static void
 allow_garbage_collection (intmax_t consing)
 {
-  consing_until_gc -= OBJECT_CT_MAX - consing;
+  consing_until_gc = consing - (OBJECT_CT_MAX - consing_until_gc);
   garbage_collection_inhibited--;
 }