Linux Kernel NULL Pointer Dereference Vulnerability in ARM DaVinci DA850 EVM

A NULL pointer dereference vulnerability has been identified in the Linux kernel's ARM DaVinci DA850 EVM configuration. This issue arises when booting the multi_v5_defconfig in QEMU under the palmetto-bmc machine, leading to a kernel panic. The problem occurs in the 'da850_evm_config_emac()' function, where the 'emac_pdata' pointer is NULL. This pointer is only populated on DaVinci machines, but the function is called on all machines during the device initialization process. As a result, the system encounters a NULL pointer dereference at a specific virtual address, causing an internal error.

Impact

Exploitation of this vulnerability leads to a kernel panic due to a NULL pointer dereference, causing a denial of service by crashing the kernel.