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[libxml] Fix integer overflows in xmlBuf and xmlBuffer - #5009
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kaidokert
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In several places, the code handling string buffers didn't check for integer overflow or used wrong types for buffer sizes. This could result in out-of-bounds writes or other memory errors when working on large, multi-gigabyte buffers. Thanks to Felix Wilhelm for the report. (cherry picked from commit 2554a2408e09f13652049e5ffb0d26196b02ebab)
… by commit 7ecc912. Issue: 399225618 Reviewed-on: youtube#5009
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Issue: 399225618