irssi -- multiple vulnerabilities

Irssi reports:

When the channel topic is set without specifying a sender, Irssi may dereference NULL pointer. Found by Joseph Bisch.

When using incomplete escape codes, Irssi may access data beyond the end of the string. Found by Joseph Bisch.

A calculation error in the completion code could cause a heap buffer overflow when completing certain strings. Found by Joseph Bisch.

When using an incomplete variable argument, Irssi may access data beyond the end of the string. Found by Joseph Bisch.

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