Stack overflow with circular references.

[pms1969]

Describe the bug
When trying to analyse a specific swagger.json file, cherrybomb exits with a stack overflow.

To Reproduce
Steps to reproduce the behavior:

1. extract the zip file; the json file contained within is 129 lines long; too big to paste here sensibly but not extravagant
2. run cherrybomb oas -f ./mvr.json
   mvr.json.zip
3. See error;

No config file was loaded to the scan, default configuration is being used


thread 'main' has overflowed its stack
fatal runtime error: stack overflow
[1]    27024 abort      cherrybomb oas -f ./mvr.json

Expected behavior
I would expect cherrybomb to identify the circular reference and warn on it.

Desktop (please complete the following information):

• OS: MacOS
• Version 12.x

Additional context
The json setup of the swagger file won't make much sense. I sanitised it, and reduced what was a ~9k line file into something as small as I was willing to go without spending too much time on it. It reliably reproduces the problem I was observing.

Discussed in discord.

[ThaDaVos]

I am having the same issue - was looking for a OpenAPI 3 validator, found cherrybomb (which looks amazing) - but sadly it fails when the api-docs contains circular references, in my case, this is caused because we have schema's referencing each other because of two way relations stuff

[RazMag]

Ive added for now a specific panic for circular references. Will soon add this as a passive test