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Fix segmentation fault when Module#name returns non string value [Bug #17754]

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* Add test for NoMethodError#to_s does not segfault

* Ensure no segfault even if Module#name is overridden
This commit is contained in:
Kenichi Kamiya 2021-03-28 08:47:42 +09:00 • committed by GitHub
parent 95d9fe9538
commit 0a544c0c35
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Notes: git 2021-03-28 08:48:17 +09:00 
Merged: https://github.com/ruby/ruby/pull/4328

Merged-By: nobu <nobu@ruby-lang.org>
2 changed files with 19 additions and 1 deletions
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4
error.c
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@ -1965,8 +1965,10 @@ name_err_mesg_to_str(VALUE obj)
d = rb_protect(name_err_mesg_receiver_name, obj, &state);
if (state || d == Qundef || d == Qnil)
d = rb_protect(rb_inspect, obj, &state);
if (state)
if (state) {
rb_set_errinfo(Qnil);
}
d = rb_check_string_type(d);
if (NIL_P(d)) {
d = rb_any_to_s(obj);
}

16
test/ruby/test_nomethod_error.rb
View file

@ -90,4 +90,20 @@ class TestNoMethodError < Test::Unit::TestCase
str.__send__(id)
end
end
def test_to_s
pre = Module.new do
def name
BasicObject.new
end
end
mod = Module.new
mod.singleton_class.prepend(pre)
err = assert_raise(NoMethodError) do
mod.this_method_does_not_exist
end
assert_match(/undefined method.+this_method_does_not_exist.+for.+Module/, err.to_s)
end
end