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patch 8.2.1677: memory access errors when calling setloclist() in autocommand

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Problem:    Memory access errors when calling setloclist() in an autocommand.
Solution:   Give an error if the list was changed unexpectedly. (closes #6946)
This commit is contained in:
Bram Moolenaar
2020-09-13 22:21:22 +02:00
parent a4224860a4
commit 4d170af0a9
3 changed files with 62 additions and 5 deletions
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41
src/quickfix.c
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@@ -216,7 +216,9 @@ static char_u *e_no_more_items = (char_u *)N_("E553: No more items");
static char_u *qf_last_bufname = NULL;
static bufref_T qf_last_bufref = {NULL, 0, 0};
static char *e_loc_list_changed =
static char *e_current_quickfix_list_was_changed =
N_("E925: Current quickfix list was changed");
static char *e_current_location_list_was_changed =
N_("E926: Current location list was changed");
/*
@@ -3108,6 +3110,7 @@ qf_jump_edit_buffer(
int *opened_window)
{
qf_list_T *qfl = qf_get_curlist(qi);
int old_changedtick = qfl->qf_changedtick;
qfltype_T qfl_type = qfl->qfl_type;
int retval = OK;
int old_qf_curlist = qi->qf_curlist;
@@ -3146,17 +3149,20 @@ qf_jump_edit_buffer(
if (qfl_type == QFLT_QUICKFIX && !qflist_valid(NULL, save_qfid))
{
emsg(_("E925: Current quickfix was changed"));
emsg(_(e_current_quickfix_list_was_changed));
return NOTDONE;
}
// Check if the list was changed. The pointers may happen to be identical,
// thus also check qf_changedtick.
if (old_qf_curlist != qi->qf_curlist
|| old_changedtick != qfl->qf_changedtick
|| !is_qf_entry_present(qfl, qf_ptr))
{
if (qfl_type == QFLT_QUICKFIX)
emsg(_("E925: Current quickfix was changed"));
emsg(_(e_current_quickfix_list_was_changed));
else
emsg(_(e_loc_list_changed));
emsg(_(e_current_location_list_was_changed));
return NOTDONE;
}
@@ -3264,10 +3270,25 @@ qf_jump_open_window(
int newwin,
int *opened_window)
{
qf_list_T *qfl = qf_get_curlist(qi);
int old_changedtick = qfl->qf_changedtick;
int old_qf_curlist = qi->qf_curlist;
qfltype_T qfl_type = qfl->qfl_type;
// For ":helpgrep" find a help window or open one.
if (qf_ptr->qf_type == 1 && (!bt_help(curwin->w_buffer) || cmdmod.tab != 0))
if (jump_to_help_window(qi, newwin, opened_window) == FAIL)
return FAIL;
if (old_qf_curlist != qi->qf_curlist
|| old_changedtick != qfl->qf_changedtick
|| !is_qf_entry_present(qfl, qf_ptr))
{
if (qfl_type == QFLT_QUICKFIX)
emsg(_(e_current_quickfix_list_was_changed));
else
emsg(_(e_current_location_list_was_changed));
return FAIL;
}
// If currently in the quickfix window, find another window to show the
// file in.
@@ -3282,6 +3303,16 @@ qf_jump_open_window(
opened_window) == FAIL)
return FAIL;
}
if (old_qf_curlist != qi->qf_curlist
|| old_changedtick != qfl->qf_changedtick
|| !is_qf_entry_present(qfl, qf_ptr))
{
if (qfl_type == QFLT_QUICKFIX)
emsg(_(e_current_quickfix_list_was_changed));
else
emsg(_(e_current_location_list_was_changed));
return FAIL;
}
return OK;
}
@@ -5834,7 +5865,7 @@ vgr_qflist_valid(
if (wp != NULL)
{
// An autocmd has freed the location list.
emsg(_(e_loc_list_changed));
emsg(_(e_current_location_list_was_changed));
return FALSE;
}
else