Re: BUG #18274: Error 'invalid XML content'

On Tue, Jan 16, 2024 at 04:55:34PM +0300, Dmitry Koval wrote:
>> - Document in a comment why a fake root node is necessary (aka the
>>  current routines don't give enough control over the limits you'd
>> like to enforce).
>
> Comment expanded (see src/backend/utils/adt/xml.c).
>
>> - The top comment of xml_parse() still mentions
>> xmlParseBalancedChunkMemory() as an effect of 483bdb2afec9, so this
>> needs to be updated.
>
> Updated.

I still need to evaluate a bit more this part, though that looks fine.

>> Also, it may be worth double-checking if there are other things marked
>> as deprecated in the upstream doc, and switch to "newer" things.
>
> I found another deprecated function xmlSubstituteEntitiesDefault [1]
> (contrib/xml2). xmlSubstituteEntitiesDefault was removed and added the
> XML_PARSE_NOENT flag in functions xmlReadMemory instead it.

This one had better be done first because it is required by your
original issue, and that's what could make the buildfarm shaky.

I have checked the other XML calls in the tree and did not spot
anything else that ought to be changed, so I have extracted this stuff
from your v2 and applied it on HEAD.  Let's see how it goes.
--
Michael