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fetchmail -- crashes when refusing a message bound for an MDA

Description:

Matthias Andree reports:

When delivering messages to a message delivery agent by means of the "mda" option, fetchmail can crash (by passing a NULL pointer to ferror() and fflush()) when refusing a message. SMTP and LMTP delivery modes aren't affected.

References:

Affects:

portaudit: fetchmail -- crashes when refusing a message bound for an MDA

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Oliver Eikemeier <eik@FreeBSD.org>