[PATCH 5.10 0/1] sched/fair: fix fault in reweight_entity()

[Fedor Pchelkin]

Syzkaller reports general protection fault at reweight_entity() in 5.10
stable releases. The problem has been fixed by the following patch which
can be applied with minor changes to the 5.10 branch.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.