Public bug reported:

Binary package hint: ejabberd

Ejabberd replies with error stanza when ACL forbids the stanza even if
the original stanza is error-stanza itself.

RFC3920/9.3.1 says «An entity that receives an error stanza MUST NOT
respond to the stanza with a further error stanza; this helps to prevent
looping»

This bug may also lead to server crash.

Examples and patch can be found at https://support.process-
one.net/browse/EJAB-930

** Affects: ejabberd (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- Don't send error stanza as reply to error stanza {EJAB-930)
+ Don't send error stanza as reply to error stanza (EJAB-930)

-- 
Don't send error stanza as reply to error stanza (EJAB-930)
https://bugs.launchpad.net/bugs/596676
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