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patch 8.2.1825: Vim9: accessing freed memory

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Problem:    Vim9: accessing freed memory.
Solution:   Clear sv_name when the variable is deleted.
This commit is contained in:
Bram Moolenaar
2020-10-10 20:31:37 +02:00
parent fcdc5d83fb
commit d747548c66
2 changed files with 21 additions and 13 deletions
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32
src/ex_eval.c
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@@ -925,22 +925,28 @@ leave_block(cstack_T *cstack)
if (in_vim9script())
{
scriptitem_T *si = SCRIPT_ITEM(current_sctx.sc_sid);
scriptitem_T *si = SCRIPT_ITEM(current_sctx.sc_sid);
hashtab_T *ht = get_script_local_ht();
for (i = cstack->cs_script_var_len[cstack->cs_idx];
i < si->sn_var_vals.ga_len; ++i)
if (ht != NULL)
{
svar_T *sv = ((svar_T *)si->sn_var_vals.ga_data) + i;
hashtab_T *ht = get_script_local_ht();
hashitem_T *hi;
if (ht != NULL)
for (i = cstack->cs_script_var_len[cstack->cs_idx];
i < si->sn_var_vals.ga_len; ++i)
{
// Remove a variable declared inside the block, if it still
// exists.
hi = hash_find(ht, sv->sv_name);
if (!HASHITEM_EMPTY(hi))
delete_var(ht, hi);
svar_T *sv = ((svar_T *)si->sn_var_vals.ga_data) + i;
hashitem_T *hi;
if (sv->sv_name != NULL)
{
// Remove a variable declared inside the block, if it still
// exists.
hi = hash_find(ht, sv->sv_name);
if (!HASHITEM_EMPTY(hi))
{
delete_var(ht, hi);
sv->sv_name = NULL;
}
}
}
}
}