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variable.c: avoid out of bound write in generic_field_set

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[Bug #21445]
This commit is contained in:
Jean Boussier 2025-06-21 13:43:50 +01:00
parent 0cec4a14fb
commit edbd9ed468
2 changed files with 9 additions and 1 deletions
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8
test/ruby/test_object_id.rb
View File

@ -115,6 +115,14 @@ class TestObjectId < Test::Unit::TestCase
assert_equal 42, copy.instance_variable_get(:@foo)
refute_predicate copy, :frozen?
end
def test_object_id_need_resize
(3 - @obj.instance_variables.size).times do |i|
@obj.instance_variable_set("@a_#{i}", "[Bug #21445]")
end
@obj.object_id
GC.start
end
end
class TestObjectIdClass < TestObjectId

2
variable.c
View File

@ -1922,7 +1922,7 @@ generic_field_set(VALUE obj, shape_id_t target_shape_id, VALUE val)
else {
attr_index_t index = RSHAPE_INDEX(target_shape_id);
if (index >= RSHAPE_CAPACITY(current_shape_id)) {
fields_obj = rb_imemo_fields_new(rb_obj_class(obj), index);
fields_obj = rb_imemo_fields_new(rb_obj_class(obj), RSHAPE_CAPACITY(target_shape_id));
if (original_fields_obj) {
attr_index_t fields_count = RSHAPE_LEN(current_shape_id);
VALUE *fields = rb_imemo_fields_ptr(fields_obj);