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Handle negative return values from syncache_expand().
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Authored by jhb on Jan 19 2021, 8:28 PM.

Details

Summary

These errors do not clear so to NULL, so the existing check was
treating these failures as success. The rest of do_pass_establish()
then tried to use the listen socket as if it was a connection socket
newly created by syncache_expand().

In addition, for negative return values, do not send a RST to the
peer.

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Repository
R10 FreeBSD src repository
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Unit
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