Fix panic when an invalid oauth2 name is passed (#20820) #20900
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Backport go-gitea#20820 When trying to access an invalid oauth2 link, we get an internal server error and can see a panic stack-trace in logs Example: Try to go to this url for a gitea installation https://<gitea_url>/user/oauth2/DoesNotExist?redirect_to= It causes an internal server error Stack trace in log ``` 2022/08/17 01:26:50 routers/web/base.go:134:1() [E] [62fc43da] PANIC: runtime error: invalid memory address or nil pointer dereference /usr/local/go/src/runtime/panic.go:220 (0x453095) /usr/local/go/src/runtime/signal_unix.go:818 (0x453065) /source/routers/web/auth/oauth.go:1100 (0x20f6ef7) /source/routers/web/auth/oauth.go:785 (0x20f4684) /source/modules/web/wrap_convert.go:47 (0x1f45196) /source/modules/web/wrap.go:41 (0x1f433c9) /usr/local/go/src/net/http/server.go:2084 (0x93cace) <clipped> ``` Root cause: In this [line](https://github.com/go-gitea/gitea/blob/a4e91c4197483c94f13e623c962b6b011494e949/models/auth/oauth2.go#L516) here, err is nil. The caller assumes no error and tries to access a `nil *Source`
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Backport #20820
When trying to access an invalid oauth2 link, we get an internal server error and can see a panic stack-trace in logs
Example:
Try to go to this url for a gitea installation
https://<gitea_url>/user/oauth2/DoesNotExist?redirect_to=
It causes an internal server error
Stack trace in log
Root cause:
In this line here, err is nil. The caller assumes no error and tries to access a
nil *Source