Re: BUG #15367: Crash in pg_fe_scram_free when using foreign tables

Michael Paquier <michael(at)paquier(dot)xyz> writes:
> On Fri, Sep 07, 2018 at 04:18:55PM -0400, Tom Lane wrote:
>> I had been studying that when the report first arrived. I'm not really
>> happy with the coding in pg_saslprep(): it leaves garbage in its output
>> parameter in some code paths, and I think it leaks memory in others.

> Agreed. Do you want to give it a go? I can see some of those code
> paths? Likely you spotted more.

Looking closer, there are no leaks, though I think we could use a comment
about that. And it still makes me itch that pg_saslprep (mostly) doesn't
worry about clearing *output on failure while only three of its four
callers bother to initialize their variables to null. That's a recipe
for future bugs. So I propose the attached cleanup.

We're still no closer to an explanation of Jeremy's failure, though
I'm now pretty sure that pg_saslprep itself isn't the issue.

regards, tom lane