CVE-2021-46993

In the Linux kernel, the following vulnerability has been resolved: sched:
Fix out-of-bound access in uclamp Util-clamp places tasks in different
buckets based on their clamp values for performance reasons. However, the
size of buckets is currently computed using a rounding division, which can
lead to an off-by-one error in some configurations. For instance, with 20
buckets, the bucket size will be 1024/20=51. A task with a clamp of 1024
will be mapped to bucket id 1024/51=20. Sadly, correct indexes are in range
[0,19], hence leading to an out of bound memory access. Clamp the bucket id
to fix the issue.