PuTTY bug pscp-start-hang

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summary: PSCP can throw away the start of an SCP session and hang waiting for it
class: bug: This is clearly an actual problem we want fixed.
difficulty: fun: Just needs tuits, and not many of them.
priority: medium: This should be fixed one day.
present-in: 0.58 0.59 0.60
fixed-in: r7651 2007-07-30

If an SCP server sends data (the initial zero byte of an SCP session) too
early, it can get processed by from_backend() before ssh_scp_recv() has started
and hence before outptr is set.  This causes the data to be discarded,
and PSCP to hang forever waiting for the handshake it's already received.

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(last revision of this bug record was at 2007-07-29 15:04:48 +0100)