In the Linux kernel, the following vulnerability has been resolved:
gpio: mt7621: avoid corruption of shared interrupt trigger state
The bank-shared fields like rising and falling are modified using non-atomic read-modify-write operations. Since every gpio chip instance represents an entire bank of 32 pins, if mediatek_gpio_irq_type() is called concurrently for different IRQs on the same bank a possible overwrite of each others configuration is possible. Thus, protect this state with gpio_generic_lock_irqsave lock in the same way it is handled in irp_chip mediatek_gpio_irq_mask() and mediatek_gpio_irq_unmask() callbacks.
References
- https://git.kernel.org/stable/c/1781172526d1092323af443fa03f00e6de560401
- https://git.kernel.org/stable/c/207d3ebf36f654a43a934addeb4d6775cb2dd667
- https://git.kernel.org/stable/c/877a243006788aaa586b2d087f27c9f3628071b0
- https://git.kernel.org/stable/c/a60a40c9ba30edd06d3fb4215fdf430ed968728e
- https://git.kernel.org/stable/c/d3b9026ef78da3018a7d2c5a9c9d611de6d45c47