patch 8.1.1827: allocating more memory than needed for extended structs commit https://github.com/vim/vim/commit/47ed553fd5bebfc36eb8aa81686eeaa5a84eccac Author: Bram Moolenaar <Bram@vim.org> Date: Thu Aug 8 20:49:14 2019 +0200 patch 8.1.1827: allocating more memory than needed for extended structs Problem: Allocating more memory than needed for extended structs. Solution: Use offsetof() instead of sizeof(). (Dominique Pelle, closes #4786)

--- a/src/syntax.c
+++ b/src/syntax.c
@@ -4394,7 +4394,7 @@ add_keyword(
 						 name_folded, MAXKEYWLEN + 1);
     else
 	name_ic = name;
-    kp = alloc(sizeof(keyentry_T) + STRLEN(name_ic));
+    kp = alloc(offsetof(keyentry_T, keyword) + STRLEN(name_ic) + 1);
     if (kp == NULL)
 	return;
     STRCPY(kp->keyword, name_ic);