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rscheck required both the pointer and the length to change, so a
separator reallocated to the same length was not detected and the
freed pointer was read.
rs = "-" * 1000
src = StringIO.new(Zlib.gzip(Random.bytes(200_000).tr("-", "x") + rs))
n = 0
io = Object.new
io.define_singleton_method(:readpartial) do |len, buf = nil|
(rs.clear << "-" * 1000) if (n += 1) == 300
src.readpartial(100, *buf)
end
Zlib::GzipReader.new(io).gets(rs)
#=> heap-use-after-free READ (with ASAN)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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rscheck required both the pointer and the length to change, so a separator reallocated to the same length was not detected and the freed pointer was read.