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consul: handle nil multierror pointer correctly #24513

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Nov 20, 2024
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@tgross tgross commented Nov 20, 2024

When the service client syncs to Consul, we accumulate service sync errors in a multierror before reading all the local checks. If the API call to the local checks fails, we either return that error or append it to the multierror and return the set of errors. But multierror.Error.Len() doesn't nil-check, so we need to do this ourselves.

I've also made a quick pass through the rest of the code base looking for multierror Len method calls to see if we have this pattern elsewhere.

Fixes: #24512

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LGTM, thanks for a quick fix!

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I'll let you be the judge if this warrants a changelog entry or not. Also: backport labels?

When the service client syncs to Consul, we accumulate service sync errors in a
multierror before reading all the local checks. If the API call to the local
checks fails, we either return that error or append it to the multierror and
return the set of errors. But `multierror.Error.Len()` doesn't nil-check, so we
need to do this ourselves.

I've also made a quick pass through the rest of the code base looking for
multierror `Len` method calls to see if we have this pattern elsewhere.

Fixes: #24512
@tgross tgross force-pushed the consul-multierr-panic branch from a24e0cb to d32fc92 Compare November 20, 2024 15:32
@tgross tgross added backport/ent/1.7.x+ent Changes are backported to 1.7.x+ent backport/ent/1.8.x+ent Changes are backported to 1.8.x+ent backport/1.9.x backport to 1.9.x release line labels Nov 20, 2024
@tgross tgross merged commit 6b9dbef into main Nov 20, 2024
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@tgross tgross deleted the consul-multierr-panic branch November 20, 2024 15:55
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agent crash on Consul check sync failures
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