Backport of fix panic in injectSANMatcher
when tlsContext
is nil
into release/1.15.x
#17189
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Backport
This PR is auto-generated from #17185 to be assessed for backporting due to the inclusion of the label backport/1.15.
The below text is copied from the body of the original PR.
Description
We frequently call
injectSANMatcher
like this. The code panics whencommonTLSContext
isnil
insideinjectSANMatcher
here.makeCommonTLSContext
returnsnil
when it isn't passed root pems.Overview of commits