[smallvec] Buffer overflow in SmallVec::insert_many

An issue was discovered in the smallvec crate before 0.6.14 and 1.x before 1.6.1 for Rust. There is a heap-based buffer overflow in SmallVec::insert_many.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-25900
• https://rustsec.org/advisories/RUSTSEC-2021-0003.html
• https://github.com/servo/rust-smallvec/issues/252
• https://github.com/advisories/GHSA-43w2-9j62-hq99