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patch 8.2.0513: reading past allocate memory when using varargs

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Problem:    Reading past allocate memory when using varargs.
Solution:   Fix copying function argument types.
This commit is contained in:
Bram Moolenaar
2020-04-05 18:20:45 +02:00
parent 5deeb3f1f9
commit 5d905c2b96
2 changed files with 16 additions and 7 deletions
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21
src/vim9compile.c
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@@ -353,7 +353,8 @@ get_func_type(type_T *ret_type, int argcount, garray_T *type_gap)
}
/*
* For a function type, reserve space for "argcount" argument types.
* For a function type, reserve space for "argcount" argument types (including
* vararg).
*/
static int
func_type_add_arg_types(
@@ -5823,16 +5824,19 @@ compile_def_function(ufunc_T *ufunc, int set_return_type)
}
{
int argcount = ufunc->uf_args.ga_len
+ (ufunc->uf_va_name == NULL ? 0 : 1);
int varargs = ufunc->uf_va_name != NULL;
int argcount = ufunc->uf_args.ga_len - (varargs ? 1 : 0);
// Create a type for the function, with the return type and any
// argument types.
ufunc->uf_func_type = get_func_type(ufunc->uf_ret_type, argcount,
&ufunc->uf_type_list);
if (argcount > 0)
// A vararg is included in uf_args.ga_len but not in uf_arg_types.
// The type is included in "tt_args".
ufunc->uf_func_type = get_func_type(ufunc->uf_ret_type,
ufunc->uf_args.ga_len, &ufunc->uf_type_list);
if (ufunc->uf_args.ga_len > 0)
{
if (func_type_add_arg_types(ufunc->uf_func_type, argcount,
if (func_type_add_arg_types(ufunc->uf_func_type,
ufunc->uf_args.ga_len,
argcount - ufunc->uf_def_args.ga_len,
&ufunc->uf_type_list) == FAIL)
{
@@ -5850,6 +5854,9 @@ compile_def_function(ufunc_T *ufunc, int set_return_type)
else
mch_memmove(ufunc->uf_func_type->tt_args,
ufunc->uf_arg_types, sizeof(type_T *) * argcount);
if (varargs)
ufunc->uf_func_type->tt_args[argcount] =
ufunc->uf_va_type == NULL ? &t_any : ufunc->uf_va_type;
}
}