net: phy: micrel: always set shared->phydev for LAN8814

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: phy: micrel: always set shared->phydev for LAN8814 Currently, during the LAN8814 PTP probe shared->phydev is only set if PTP clock gets actually set, otherwise the function will return before setting it. This is an issue as shared->phydev is unconditionally being used when IRQ is being handled, especially in lan8814_gpio_process_cap and since it was not set it will cause a NULL pointer exception and crash the kernel. So, simply always set shared->phydev to avoid the NULL pointer exception.

References

• https://git.kernel.org/stable/c/da1ef8e9eb5d4a12bec32d11636e521e7d529b9e
• https://git.kernel.org/stable/c/b093b06826b836c2824858669db080c190c04715
• https://git.kernel.org/stable/c/399d10934740ae8cdaa4e3245f7c5f6c332da844