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Avoid segfaults if someone sets 'composition-function-table' to nil

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* src/composite.c (composition_compute_stop_pos)
(composition_reseat_it): Recreate 'composition-function-table' if
it ever becomes garbled.  (Bug#80462)
This commit is contained in:
Eli Zaretskii 2026-02-21 19:27:17 +02:00
parent b055b6e889
commit f3555fc846
1 changed files with 6 additions and 0 deletions
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6
src/composite.c
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@ -1101,6 +1101,9 @@ composition_compute_stop_pos (struct composition_it *cmp_it, ptrdiff_t charpos,
/* Look for automatic compositions. */
start = charpos;
/* For the case that they set it to something weird, like nil. */
if (!CHAR_TABLE_P (Vcomposition_function_table))
Vcomposition_function_table = Fmake_char_table (Qnil, Qnil);
if (charpos < endpos)
{
/* Forward search. */
@ -1324,6 +1327,9 @@ composition_reseat_it (struct composition_it *cmp_it, ptrdiff_t charpos,
Lisp_Object lgstring = Qnil;
Lisp_Object val, elt, direction = Qnil;
/* For the case that they set it to something weird, like nil. */
if (!CHAR_TABLE_P (Vcomposition_function_table))
Vcomposition_function_table = Fmake_char_table (Qnil, Qnil);
val = CHAR_TABLE_REF (Vcomposition_function_table, cmp_it->ch);
for (EMACS_INT i = 0; i < cmp_it->rule_idx; i++, val = XCDR (val))
continue;