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util.error: Fix error on conversion of invalid error stanza, fix #1805

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Error stanzas should have an <error> element, but if you pass a
stanza without one to util.error.from_stanza() it triggers an attempt to
index a nil value, which this patch avoids.

In the conditional, it should be safe to assume error_tag is non-nil
since condition can't have those values then.
This commit is contained in:
Kim Alvefur 2023-04-19 11:32:53 +02:00
parent 506ee45da2
commit 57c3771614
1 changed files with 1 additions and 1 deletions
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2
util/error.lua
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@ -141,7 +141,7 @@ local function from_stanza(stanza, context, source)
local error_tag = stanza:get_child("error");
context = context or {};
context.stanza = stanza;
context.by = error_tag.attr.by or stanza.attr.from;
context.by = error_tag and error_tag.attr.by or stanza.attr.from;
local uri;
if condition == "gone" or condition == "redirect" then