kernel: mm/mempolicy: fix uninit-value in mpol_rebind_policy()

In the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix uninit-value in mpolrebindpolicy mpolsetnodemaskmm/mempolicy.c does not set up nodemask when pol-mode is MPOLLOCAL. Check pol-mode before access pol-w.cpusetmemsallowed in mpolrebindpolicymm/mempolicy.c. BUG:...