net: phy: fix phy_get_internal_delay accessing an empty array

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: net: phy: fix phy_get_internal_delay accessing an empty array The phy_get_internal_delay function could try to access to an empty array in the case that the driver is calling phy_get_internal_delay without defining delay_values and rx-internal-delay-ps or tx-internal-delay-ps is defined to 0 in the device-tree. This will lead to "unable to handle kernel NULL pointer dereference at virtual address 0". To avoid this kernel oops, the test should be delay >= 0. As there is already delay < 0 test just before, the test could only be size == 0.

References

• https://git.kernel.org/stable/c/06dd21045a7e8bc8701b0ebedcd9a30a6325878b
• https://git.kernel.org/stable/c/0e939a002c8a7d66e60bd0ea6b281fb39d713c1a
• https://git.kernel.org/stable/c/2a2ff709511617de9c6c072eeee82bcbbdfecaf8
• https://git.kernel.org/stable/c/589ec16174dd9378953b8232ae76fad0a96e1563
• https://git.kernel.org/stable/c/c0691de7df1d51482a52cac93b7fe82fd9dd296b
• https://git.kernel.org/stable/c/0307cf443308ecc6be9b2ca312bb31bae5e5a7ad
• https://git.kernel.org/stable/c/4469c0c5b14a0919f5965c7ceac96b523eb57b79