[7.x] Added check to avoid endless loop in MailManager::createTransport #32549
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GrahamCampbell
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When upgrading to Laravel 7 I found out that a misconfiguration of the new
mail.mailers.*config can lead to an endless loop inMailManager::createTransport()which is caused by an emptytransport-key inmail.mailers.{ANY_MAILER}.This happed to us when we were migrating or multi-tenant SMTP configuration to new mailers pattern and as we used
driverinstead oftransportin the configuration ran into a memory overflow due to the described endless loop.This MR adds a check, as well as tests for it, to ensure that
transport-key in$configinMailManager::createTransport()is not empty, where not empty means unequal tonull,""and" ".This MR points the user to the right place of misconfiguration and does not break any existing features.