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Alberto Bertogli
ce236e91bc
When parsing a header that has a continuation line, today we append that line to it, which copies the whole header each time. On normal messages this is negligible, but a header with a very large number of continuation lines would cause a DoS through work amplification. This patch fixes the problem by making header continuation handling linear: we now accumulate the header lines in a list, and then join them only once. Thanks to John JEAN <john@wargan.com> who reported a similar issue (fixed in a previous patch), which led to finding this bug.