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Get rid of indirect sharing

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* string.c (str_duplicate): share the root shared string if the
  original string is already sharing, so that all shared strings
  refer the root shared string directly.  indirect sharing can
  cause a dangling pointer.

[Bug #15792]
This commit is contained in:
Nobuyoshi Nakada 2019-04-27 21:21:55 +09:00
parent afb361dfd0
commit 3f9562015e
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2 changed files with 17 additions and 3 deletions
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5
string.c
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@ -1505,10 +1505,15 @@ str_duplicate(VALUE klass, VALUE str)
char, embed_size);
if (flags & STR_NOEMBED) {
if (UNLIKELY(!(flags & FL_FREEZE))) {
if (FL_TEST_RAW(str, STR_SHARED)) {
str = RSTRING(str)->as.heap.aux.shared;
}
else {
str = str_new_frozen(klass, str);
FL_SET_RAW(str, flags & FL_TAINT);
flags = FL_TEST_RAW(str, flag_mask);
}
}
if (flags & STR_NOEMBED) {
RB_OBJ_WRITE(dup, &RSTRING(dup)->as.heap.aux.shared, str);
flags |= STR_SHARED;

9
test/ruby/test_string.rb
View file

@ -2961,6 +2961,15 @@ CODE
end
=end
def test_nesting_shared
a = ('a' * 24).encode(Encoding::ASCII).gsub('x', '')
hash = {}
hash[a] = true
assert_equal(('a' * 24), a)
4.times { GC.start }
assert_equal(('a' * 24), a, '[Bug #15792]')
end
def test_shared_force_encoding
s = "\u{3066}\u{3059}\u{3068}".gsub(//, '')
h = {}