Linux Kernel Pinctrl Device Tree Null Pointer Dereference Vulnerability

A null pointer dereference vulnerability has been identified in the Linux kernel's pinctrl device tree handling. This issue arises in the 'pinctrl_dt_to_map' function, where a failure in memory allocation can lead to a null pointer being dereferenced, causing a crash. The vulnerability was reported by KASAN, which detected the null pointer dereference during a string comparison operation. The issue occurs when 'kasprintf' fails to allocate memory, returning a null pointer that is not properly handled, leading to a dereference of a null address.

Impact

Exploitation of this vulnerability causes a null pointer dereference, leading to a kernel crash.