Mercurial > vim
view src/proto/textprop.pro @ 33815:08f9e1eac4cf v9.0.2123
patch 9.0.2123: Problem with initializing the length of range() lists
Commit: https://github.com/vim/vim/commit/df63da98d8dc284b1c76cfe1b17fa0acbd6094d8
Author: Christian Brabandt <cb@256bit.org>
Date: Thu Nov 23 20:14:28 2023 +0100
patch 9.0.2123: Problem with initializing the length of range() lists
Problem: Problem with initializing the length of range() lists
Solution: Set length explicitly when it shouldn't contain any items
range() may cause a wrong calculation of list length, which may later
then cause a segfault in list_find(). This is usually not a problem,
because range_list_materialize() calculates the length, when it
materializes the list.
In addition, in list_find() when the length of the range was wrongly
initialized, it may seem to be valid, so the check for list index
out-of-bounds will not be true, because it is called before the list is
actually materialized. And so we may eventually try to access a null
pointer, causing a segfault.
So this patch does 3 things:
- In f_range(), when we know that the list should be empty, explicitly
set the list->lv_len value to zero. This should happen, when
start is larger than end (in case the stride is positive) or
end is larger than start when the stride is negative.
This should fix the underlying issue properly. However,
- as a safety measure, let's check that the requested index is not
out of range one more time, after the list has been materialized
and return NULL in case it suddenly is.
- add a few more tests to verify the behaviour.
fixes: #13557
closes: #13563
Co-authored-by: Tim Pope <tpope@github.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
| author | Christian Brabandt <cb@256bit.org> |
|---|---|
| date | Thu, 23 Nov 2023 20:30:07 +0100 |
| parents | 243c35fad9cb |
| children |
line wrap: on
line source
/* textprop.c */ int find_prop_type_id(char_u *name, buf_T *buf); void f_prop_add(typval_T *argvars, typval_T *rettv); void f_prop_add_list(typval_T *argvars, typval_T *rettv); int prop_add_common(linenr_T start_lnum, colnr_T start_col, dict_T *dict, buf_T *default_buf, typval_T *dict_arg); int get_text_props(buf_T *buf, linenr_T lnum, char_u **props, int will_change); int prop_count_above_below(buf_T *buf, linenr_T lnum); int count_props(linenr_T lnum, int only_starting, int last_line); void sort_text_props(buf_T *buf, textprop_T *props, int *idxs, int count); int find_visible_prop(win_T *wp, int type_id, int id, textprop_T *prop, linenr_T *found_lnum); void add_text_props(linenr_T lnum, textprop_T *text_props, int text_prop_count); proptype_T *text_prop_type_by_id(buf_T *buf, int id); int text_prop_type_valid(buf_T *buf, textprop_T *prop); void f_prop_clear(typval_T *argvars, typval_T *rettv); void f_prop_find(typval_T *argvars, typval_T *rettv); void f_prop_list(typval_T *argvars, typval_T *rettv); void f_prop_remove(typval_T *argvars, typval_T *rettv); void f_prop_type_add(typval_T *argvars, typval_T *rettv); void f_prop_type_change(typval_T *argvars, typval_T *rettv); void f_prop_type_delete(typval_T *argvars, typval_T *rettv); void f_prop_type_get(typval_T *argvars, typval_T *rettv); void f_prop_type_list(typval_T *argvars, typval_T *rettv); void clear_global_prop_types(void); void clear_buf_prop_types(buf_T *buf); int adjust_prop_columns(linenr_T lnum, colnr_T col, int bytes_added, int flags); void adjust_props_for_split(linenr_T lnum_props, linenr_T lnum_top, int kept, int deleted, int at_eol); void prepend_joined_props(char_u *new_props, int propcount, int *props_remaining, linenr_T lnum, int last_line, long col, int removed); /* vim: set ft=c : */