Linux Kernel Ralink Pinctrl Null Pointer Dereference Vulnerability

A vulnerability in the Linux kernel's pinctrl subsystem for Ralink devices can lead to a null pointer dereference. This issue arises because the memory allocation function devm_kcalloc can fail, potentially leaving data->domains as a null pointer. If this null pointer is later dereferenced, it can cause a crash. The vulnerability has been addressed by adding a check for null allocations, ensuring that -ENOMEM is returned without manually releasing data if the allocation fails.

Impact

Exploitation of this vulnerability can lead to a null pointer dereference, causing a kernel crash.