comedi: aio_iiro_16: Fix bit shift out of bounds

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: comedi: aio_iiro_16: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: if ((1 << it->options[1]) & 0xdcfc) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Valid `it->options[1]` values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts.

References

• https://git.kernel.org/stable/c/a88692245c315bf8e225f205297a6f4b13d6856a
• https://git.kernel.org/stable/c/5ac7c60439236fb691b8c7987390e2327bbf18fa
• https://git.kernel.org/stable/c/c593215385f0c0163015cca4512ed3ff42875d19
• https://git.kernel.org/stable/c/ff30dd3f15f443d2a0085b12ec2cc95d44f35fa7
• https://git.kernel.org/stable/c/955e8835855fed8e87f7d8c8075564a1746c1b4c
• https://git.kernel.org/stable/c/e0f3c0867d7d231c70984f05c97752caacd0daba
• https://git.kernel.org/stable/c/43ddd82e6a91913cea1c078e782afd8de60c3a53
• https://git.kernel.org/stable/c/66acb1586737a22dd7b78abc63213b1bcaa100e4