Well, we certainly are not going to break pq_recvbuf in such a
fundamental way as that ;-). I think that the more likely place
to work around this is going to be in pam_passwd_conv_proc() in
src/backend/libpq/auth.c. In particular, I see that when it gets
a NULL from recv_password_packet (which is what's going to happen
when pq_recvbuf returns EOF), it returns PAM_CONV_ERR without
bothering to set *resp. I wonder whether we need to be initializing
*resp to NULL, or even making it really valid?
regards, tom lane
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