https://bugzilla.wikimedia.org/show_bug.cgi?id=65081
Bug ID: 65081
Summary: Scribunto gives half bytes to preprocessor which gives
a fatal
Product: MediaWiki extensions
Version: REL1_23 branch
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Scribunto
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Web browser: ---
Mobile Platform: ---
User PerfektesChaos from dewiki has wrote a example lua module, which produces
a fatal in the php preprocessor.
The module is:
-- Cause a server crash.
-- includes/parser/Preprocessor_DOM.php line 1692:
-- "Call to a member function item() on a non-object"
-- Crashes any 1.24wmf1 wiki, not only beta.wmflabs.org
local p = { }
function p.f( frame )
local story = "รถ" -- non-ASCII char
local sub = story:sub( 1, 1 ) -- ASCII substring at half of UTF-8
-- should have been mw.ustring.sub()
return frame:callParserFunction( "#tag:nowiki", { sub } )
end -- p.f
return p
The error is:
includes/parser/Preprocessor_DOM.php line 1692: "Call to a member function
item() on a non-object"
I have run it with warnings on on my dev machine and the output is:
Warning: DOMDocument::loadXML() [domdocument.loadxml]: Input is not proper
UTF-8, indicate encoding ! Bytes: 0xC3 0x3C 0x2F 0x76 in Entity, line: 1 in
\includes\parser\Preprocessor_DOM.php on line 85
Notice: Trying to get property of non-object in
\includes\parser\Preprocessor_DOM.php on line 88
Fatal error: Call to a member function item() on a non-object in
\includes\parser\Preprocessor_DOM.php on line 1692
See http://de.wikipedia.beta.wmflabs.org/wiki/MakeTheServerCrash for more
information and a link to the example page.
Looks like the half byte is mangeled into the builded xml in the preprocessor
and than it gives a invalid xml.
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