CVE-2021-32765

Hiredis is a minimalistic C client library for the Redis database. In affected
versions Hiredis is vulnurable to integer overflow if provided maliciously
crafted or corrupted `RESP` `mult-bulk` protocol data. When parsing
`multi-bulk`
(array-like) replies, hiredis fails to check if `count * sizeof(redisReply*)`
can be represented in `SIZE_MAX`. If it can not, and the `calloc()` call
doesn't
itself make this check, it would result in a short allocation and subsequent
buffer overflow. Users of hiredis who are unable to update may set the
[maxelements](https://github.com/redis/hiredis#reader-max-array-elements)
context option to a value small enough that no overflow is possible.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-32765
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-32765
https://github.com/redis/hiredis/security/advisories/GHSA-hfm9-39pp-55p2
https://github.com/redis/hiredis/commit/76a7b10005c70babee357a7d0f2becf28ec7ed1e
https://wiki.sei.cmu.edu/confluence/display/c/MEM07-C.+Ensure+that+the+arguments+to+calloc%28%29%2C+when+multiplied%2C+do+not+wrap