gmarkup: Add a limit on the number of attributes in an element
While the XML specification doesn’t prescribe a limit, no reasonable bit
of XML is going to have more than 1000 attributes in a single XML
element.
Adding a limit reduces the changes of a runaway allocation loop caused
by dodgy input.
oss-fuzz#12960
Signed-off-by:
Philip Withnall <withnall@endlessm.com>
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