CVE-2025-40346

In the Linux kernel, the following vulnerability has been resolved:

arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()

Fix incorrect use of PTR_ERR_OR_ZERO() in topology_parse_cpu_capacity()

which causes the code to proceed with NULL clock pointers. The current

logic uses !PTR_ERR_OR_ZERO(cpu_clk) which evaluates to true for both

valid pointers and NULL, leading to potential NULL pointer dereference

in clk_get_rate().

Per include/linux/err.h documentation, PTR_ERR_OR_ZERO(ptr) returns:

"The error code within @ptr if it is an error pointer; 0 otherwise."

This means PTR_ERR_OR_ZERO() returns 0 for both valid pointers AND NULL

pointers. Therefore !PTR_ERR_OR_ZERO(cpu_clk) evaluates to true (proceed)

when cpu_clk is either valid or NULL, causing clk_get_rate(NULL) to be

called when of_clk_get() returns NULL.

Replace with !IS_ERR_OR_NULL(cpu_clk) which only proceeds for valid

pointers, preventing potential NULL pointer dereference in clk_get_rate().