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80ddb590b6
The code wrote a value into the caller's field[] array before checking
to see if there was room, which of course is backwards. Per report from
Michael Paquier.
I fixed the equivalent bug in the backend's version of this code way back
in 630684d3a1, but failed to think about ecpg's copy. Fortunately
this doesn't look like it would be exploitable for anything worse than a
core dump: an external attacker would have no control over the single word
that gets written.