Merge tag 'bitmap-for-6.17-rc5' of https://github.com/norov/linux

Pull bitmap fix from Yury Norov:
"Fix sched_numa_find_nth_cpu() if mask offline

sched_numa_find_nth_cpu() uses a bsearch to look for the 'closest' CPU
in sched_domains_numa_masks and given cpus mask. However they might
not intersect if all CPUs in the cpus mask are offline.

bsearch will return NULL in that case, bail out instead of
dereferencing a bogus pointer"

* tag 'bitmap-for-6.17-rc5' of https://github.com/norov/linux:
sched: Fix sched_numa_find_nth_cpu() if mask offline

kernel/sched/topology.c

···
 		goto unlock;
 
 	hop_masks = bsearch(&k, k.masks, sched_domains_numa_levels, sizeof(k.masks[0]), hop_cmp);
+	if (!hop_masks)
+		goto unlock;
 	hop = hop_masks	- k.masks;
 
 	ret = hop ?