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/textprop.c
+++ b/src/textprop.c
@@ -695,7 +695,7 @@ prop_type_set(typval_T *argvars, int add
 	    semsg(_("E969: Property type %s already defined"), name);
 	    return;
 	}
-	prop = alloc_clear(sizeof(proptype_T) + STRLEN(name));
+	prop = alloc_clear(offsetof(proptype_T, pt_name) + STRLEN(name) + 1);
 	if (prop == NULL)
 	    return;
 	STRCPY(prop->pt_name, name);