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Description of problem:

See https://bugzilla.mozilla.org/show_bug.cgi?id=1682044


pkix_Build_GatherCerts() + pkix_CacheCert_Add() can corrupt "cachedCertTable"


pkix_Build_GatherCerts() has two code paths for creating the list "certsFound":

    pkix_CacheCert_Lookup()
    this sets "certsFound" to a new list
    "certsFound" and "cachedCertTable" share items but not the list

    pkix_CacheCert_Add(pkix_pl_Pk11CertStore_CertQuery())
    this sets "certsFound" to a new list; and then adds the list to "cachedCertTable"
    "certsFound" and "cachedCertTable" share a linked list

Because the latter doesn't create a separate list, deleting list elements from "certsFound" can also delete list elements from within "cacheCertTable". And if this happens while pkix_CacheCert_Lookup() is trying to update the same element's reference, a core dump can result.

upstream patch will be picked up in the rebase.

Need zstream+ to attach to the errrata.