CVE-2025-38704

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

rcu/nocb: Fix possible invalid rdp's->nocb_cb_kthread pointer access

In the preparation stage of CPU online, if the corresponding

the rdp's->nocb_cb_kthread does not exist, will be created,

there is a situation where the rdp's rcuop kthreads creation fails,

and then de-offload this CPU's rdp, does not assign this CPU's

rdp->nocb_cb_kthread pointer, but this rdp's->nocb_gp_rdp and

rdp's->rdp_gp->nocb_gp_kthread is still valid.

This will cause the subsequent re-offload operation of this offline

CPU, which will pass the conditional check and the kthread_unpark()

will access invalid rdp's->nocb_cb_kthread pointer.

This commit therefore use rdp's->nocb_gp_kthread instead of

rdp_gp's->nocb_gp_kthread for safety check.