There is a similar problem to the one descibed in my previous post, this time in fhandler_tty_slave::tcflush, line 1051: ret = len >= 0. This can never be false, because len is unsigned. And it also seems wrong because tcflush() should return either 0 on success or -1 on error. The way it is coded it will return either 0 or 1. Maybe comparison to (size_t) -1 was intended instead?
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