As per https://en.cppreference.com/w/cpp/string/byte/memcpy, calling
std::memcpy with dest or src as nullptr is UB.
This CL prevents this from happening and is also looking into
why UBSan didn't catch the issue.
Bug: webrtc:14292
Change-Id: I99833f28ac865719d0dcb02c4de00f33a48c3992
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/271502
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37783}
48ac38ec9b