RUSTSEC-2021-0012

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RUSTSEC-2021-0012

Summary: Reading uninitialized memory can cause UB (`Deserializer::read_vec`)

Details: `Deserializer::read_vec()` created an uninitialized buffer and passes it to a user-provided `Read` implementation (`Deserializer.reader.read_exact()`). Passing an uninitialized buffer to an arbitrary `Read` implementation is currently defined as undefined behavior in Rust. Official documentation for the `Read` trait explains the following: "It is your responsibility to make sure that buf is initialized before calling read. Calling read with an uninitialized buf (of the kind one obtains via MaybeUninit<T>) is not safe, and can lead to undefined behavior." The flaw was corrected in commit ce310f7 by zero-initializing the newly allocated buffer before handing it to `Deserializer.reader.read_exact()`.

References: https://crates.io/crates/cdr, https://rustsec.org/advisories/RUSTSEC-2021-0012.html, https://github.com/hrektts/cdr-rs/issues/10