CVE-2021-28031: move_elements can double-free objects on panic

May 24, 2022 (updated June 13, 2023)

Affected versions of scratchpad used ptr::read to read elements while calling a user provided function f on them. Since the pointer read duplicates ownership, a panic inside the user provided f function could cause a double free when unwinding.

The flaw was fixed in commit 891561bea by removing the unsafe block and using a plain iterator.

References

github.com/advisories/GHSA-3qm2-rfqw-fmrw
github.com/okready/scratchpad
github.com/okready/scratchpad/commit/891561bea
github.com/okready/scratchpad/issues/1
nvd.nist.gov/vuln/detail/CVE-2021-28031
rustsec.org/advisories/RUSTSEC-2021-0030.html

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