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We call read_istream, but never check its return value for errors. This can lead to us looping infinitely, as we just keep trying to write "-1" bytes (and we do not notice the error, as we simply check that write_in_full reports the same number of bytes we fed it, which of course is also -1). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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