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patch 8.2.1537: memory acccess error when using setcellwidths()

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Problem:    Memory acccess error when using setcellwidths().
Solution:   Use array and pointers correctly.
This commit is contained in:
Bram Moolenaar
2020-08-28 23:27:20 +02:00
parent 4e4473c927
commit b06a6d59d1
4 changed files with 13 additions and 10 deletions
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17
src/mbyte.c
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@@ -5421,8 +5421,8 @@ cw_value(int c)
static int
tv_nr_compare(const void *a1, const void *a2)
{
listitem_T *li1 = (listitem_T *)a1;
listitem_T *li2 = (listitem_T *)a2;
listitem_T *li1 = *(listitem_T **)a1;
listitem_T *li2 = *(listitem_T **)a2;
return li1->li_tv.vval.v_number - li2->li_tv.vval.v_number;
}
@@ -5470,8 +5470,10 @@ f_setcellwidths(typval_T *argvars, typval_T *rettv UNUSED)
vim_free(ptrs);
return;
}
for (lili = li->li_tv.vval.v_list->lv_first, i = 0; lili != NULL;
lili = lili->li_next, ++i)
lili = li->li_tv.vval.v_list->lv_first;
ptrs[item] = lili;
for (i = 0; lili != NULL; lili = lili->li_next, ++i)
{
if (lili->li_tv.v_type != VAR_NUMBER)
break;
@@ -5505,7 +5507,7 @@ f_setcellwidths(typval_T *argvars, typval_T *rettv UNUSED)
vim_free(ptrs);
return;
}
ptrs[item++] = lili;
++item;
}
// Sort the list on the first number.
@@ -5520,9 +5522,9 @@ f_setcellwidths(typval_T *argvars, typval_T *rettv UNUSED)
// Store the items in the new table.
item = 0;
for (li = l->lv_first; li != NULL; li = li->li_next)
for (item = 0; item < l->lv_len; ++item)
{
listitem_T *lili = li->li_tv.vval.v_list->lv_first;
listitem_T *lili = ptrs[item];
varnumber_T n1;
n1 = lili->li_tv.vval.v_number;
@@ -5538,7 +5540,6 @@ f_setcellwidths(typval_T *argvars, typval_T *rettv UNUSED)
table[item].last = lili->li_tv.vval.v_number;
lili = lili->li_next;
table[item].width = lili->li_tv.vval.v_number;
++item;
}
vim_free(ptrs);