Security vulnerabilities and automated fixes for gpio issues
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A high-severity out-of-bounds access vulnerability was discovered and patched in the `py32ioexp` Linux GPIO expander driver. The `py32io_gpio_direction_input()` function failed to validate a user-supplied pin offset against the chip's declared GPIO count, opening the door to memory corruption via the GPIO character device interface. A two-line bounds check now closes the vulnerability cleanly and efficiently.