fix(dpx): detect corrupt userbuf size, overflow guard#5271
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- Detect corrupted userbuf size. - Pprotection against integer multiply overflow in various places in the DPX reading code. - Also fix memory load alignment issue. Didn't seem to be a problem in practice, but the sanitizers weren't happy on some platforms.. Assisted-by: Claude Code / sonnet-4.6 Signed-off-by: Larry Gritz <lg@larrygritz.com>
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Assisted-by: Claude Code / sonnet-4.6