CVE-2024-26978

In the Linux kernel, the following vulnerability has been resolved:

serial: max310x: fix NULL pointer dereference in I2C instantiation

When trying to instantiate a max14830 device from userspace:

echo max14830 0x60 > /sys/bus/i2c/devices/i2c-2/new_device

we get the following error:

Unable to handle kernel NULL pointer dereference at virtual address…
…
Call trace:
max310x_i2c_probe+0x48/0x170 [max310x]
i2c_device_probe+0x150/0x2a0
…

Add check for validity of devtype to prevent the error, and abort probe
with a meaningful error message.

More information : https://git.kernel.org/stable/c/0d27056c24efd3d63a03f3edfbcfc4827086b110