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[ruby/stringio] Fix SEGV at unget to a null device StringIO

Browse Source 
https://github.com/ruby/stringio/commit/eb4ee49218
This commit is contained in:
Nobuyoshi Nakada 2025-02-21 19:40:58 +09:00 committed by git
parent fa6b9f75ef
commit 7ef9110b1e
2 changed files with 7 additions and 1 deletions
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2
ext/stringio/stringio.c
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@ -180,8 +180,10 @@ check_modifiable(struct StringIO *ptr)
else if (OBJ_FROZEN_RAW(ptr->string)) { else if (OBJ_FROZEN_RAW(ptr->string)) {
rb_raise(rb_eIOError, "not modifiable string"); rb_raise(rb_eIOError, "not modifiable string");
} }
else {
rb_str_modify(ptr->string); rb_str_modify(ptr->string);
} }
}
static VALUE static VALUE
strio_s_allocate(VALUE klass) strio_s_allocate(VALUE klass)

4
test/stringio/test_stringio.rb
View File

@ -64,6 +64,10 @@ class TestStringIO < Test::Unit::TestCase
assert_nil io.gets assert_nil io.gets
io.puts "abc" io.puts "abc"
assert_nil io.string assert_nil io.string
# Null device StringIO just drop ungot string
io.ungetc '#'
assert_nil io.getc
end end
def test_truncate def test_truncate