iio: accel: bmc150: Fix irq assumption regression

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: iio: accel: bmc150: Fix irq assumption regression The code in bmc150-accel-core.c unconditionally calls bmc150_accel_set_interrupt() in the iio_buffer_setup_ops, such as on the runtime PM resume path giving a kernel splat like this if the device has no interrupts: Unable to handle kernel NULL pointer dereference at virtual address 00000001 when read PC is at bmc150_accel_set_interrupt+0x98/0x194 LR is at __pm_runtime_resume+0x5c/0x64 (...) Call trace: bmc150_accel_set_interrupt from bmc150_accel_buffer_postenable+0x40/0x108 bmc150_accel_buffer_postenable from __iio_update_buffers+0xbe0/0xcbc __iio_update_buffers from enable_store+0x84/0xc8 enable_store from kernfs_fop_write_iter+0x154/0x1b4 This bug seems to have been in the driver since the beginning, but it only manifests recently, I do not know why. Store the IRQ number in the state struct, as this is a common pattern in other drivers, then use this to determine if we have IRQ support or not.

References

• https://git.kernel.org/stable/c/aad9d048a3211c48ec02efa405bf462856feb862
• https://git.kernel.org/stable/c/c891f504bb66604c822e7985e093cf39b97fdeb0
• https://git.kernel.org/stable/c/cdd4a9e98004bd7c7488311951fa6dbae38b2b80
• https://git.kernel.org/stable/c/65ad4ed983fd9ee0259d86391d6a53f78203918c
• https://git.kernel.org/stable/c/93eaa5ddc5fc4f50ac396afad8ce261102ebd4f3
• https://git.kernel.org/stable/c/3aa385a9c75c09b59dcab2ff76423439d23673ab