PSA: Fix for CVE-2022-2294

[Harald Alvestrand]

A CVE has been issued related to an issue in the webrtc library.
If you are working to WebRTC HEAD, this issue is fixed.

If not, we recommend that you merge the following two CLs:

https://webrtc-review.googlesource.com/c/src/+/267281
https://webrtc-review.googlesource.com/c/src/+/267628

For more information, see this Twitter thread:

https://twitter.com/natashenka/status/1550259898880909314

The WebRTC team