inspector: fix out-of-bounds read in ws frame decoding#64618
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Signed-off-by: nashit hayyat <nashit@bugqore.com>
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decode_frame_hybi17 checks the announced payload length against buffer.size(), but the payload is read from it + kMaskingKeyWidthInBytes, after the iterator has already walked past the two byte header and the extended length field. A client that sends only the two header bytes of a masked frame, 0x81 0xFD, underflows buffer.size() - kMaskingKeyWidthInBytes to SIZE_MAX, passes the check, and the unmasking loop reads 125 bytes past a two byte vector; the bytes it picks up go to OnWsFrame and back out to the peer. Measuring against what is left after the header fixes both that underflow and the header bytes the old check never accounted for.