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vim-patch:8.1.1968: crash when using nested map() (#27029)

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Problem:    Crash when using nested map().
Solution:   Clear the pointer in prepare_vimvar(). (Ozaki Kiichi,
            closes vim/vim#4890, closes vim/vim#4891)

27da7de7c5

Cherry-pick Test_filter_map_nested() from patch 8.1.1964.

Co-authored-by: Bram Moolenaar <Bram@vim.org>
This commit is contained in:
zeertzjq
2024-01-16 09:32:57 +08:00
committed by GitHub
parent 73e1942abe
commit a34451982f
3 changed files with 16 additions and 1 deletions
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4
src/nvim/eval.c
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@@ -1095,17 +1095,19 @@ bool is_compatht(const hashtab_T *ht)
}
/// Prepare v: variable "idx" to be used.
/// Save the current typeval in "save_tv".
/// Save the current typeval in "save_tv" and clear it.
/// When not used yet add the variable to the v: hashtable.
void prepare_vimvar(int idx, typval_T *save_tv)
{
*save_tv = vimvars[idx].vv_tv;
vimvars[idx].vv_str = NULL; // don't free it now
if (vimvars[idx].vv_type == VAR_UNKNOWN) {
hash_add(&vimvarht, vimvars[idx].vv_di.di_key);
}
}
/// Restore v: variable "idx" to typeval "save_tv".
/// Note that the v: variable must have been cleared already.
/// When no longer defined, remove the variable from the v: hashtable.
void restore_vimvar(int idx, typval_T *save_tv)
{