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If *async_reply isn't set then the calling code will reply to the
control and free the control structure. In some places the control
structure pointer is stolen onto state before a synchronous exit due
to an error condition. The error handling then frees state and
returns an error. The calling code will access-after-free when trying
to reply to the control.
To make this easier to understand, the convention is that any
(immediate) error results in a synchronous reply to the control via an
error return code AND *async_reply not being set. In this case the
control structure pointer should never be stolen onto state. State is
never used for a synchronous reply, it is only ever used by a
callback.
Also initialise state->c to NULL so that any premature call to a
callback (e.g. in an immediate error path) is more obvious.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12180
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
9d975b860d