You're completely right.
What I see is that no status information is propagated to the Curl_disconnect function.Should the connection be marked as premature=TRUE if status==ABORT?

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** [bugs:#1184] SMTP: libcurl hangs when returning CURL_READFUNC_ABORT from readfunc callback**
**Status:** open
**Created:** Fri Jan 25, 2013 10:30 AM UTC by Patricia Muscalu
**Last Updated:** Fri Jan 25, 2013 04:56 PM UTC
**Owner:** nobody
The problem appears in 7.24 (I've not tested the earlier versions of libcurl).
The problem can also be reproduces with libcurl 7.28. 
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