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- Fix a NULL-ptr dereference when recalculating a sched entity's weight 

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Merge tag 'sched_urgent_for_v5.17_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fix from Borislav Petkov:
 "Fix a NULL-ptr dereference when recalculating a sched entity's weight"

* tag 'sched_urgent_for_v5.17_rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Fix fault in reweight_entity
This commit is contained in:
Linus Torvalds 2022-02-13 09:27:26 -08:00
parent f5e02656b1 13765de814
commit 6f35736723
1 changed files with 6 additions and 5 deletions
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11
kernel/sched/core.c
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@ -1214,8 +1214,9 @@ int tg_nop(struct task_group *tg, void *data)
}
#endif
static void set_load_weight(struct task_struct *p, bool update_load)
static void set_load_weight(struct task_struct *p)
{
bool update_load = !(READ_ONCE(p->__state) & TASK_NEW);
int prio = p->static_prio - MAX_RT_PRIO;
struct load_weight *load = &p->se.load;
@ -4406,7 +4407,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p)
p->static_prio = NICE_TO_PRIO(0);
p->prio = p->normal_prio = p->static_prio;
set_load_weight(p, false);
set_load_weight(p);
/*
* We don't need the reset flag anymore after the fork. It has
@ -6921,7 +6922,7 @@ void set_user_nice(struct task_struct *p, long nice)
put_prev_task(rq, p);
p->static_prio = NICE_TO_PRIO(nice);
set_load_weight(p, true);
set_load_weight(p);
old_prio = p->prio;
p->prio = effective_prio(p);
@ -7212,7 +7213,7 @@ static void __setscheduler_params(struct task_struct *p,
*/
p->rt_priority = attr->sched_priority;
p->normal_prio = normal_prio(p);
set_load_weight(p, true);
set_load_weight(p);
}
/*
@ -9445,7 +9446,7 @@ void __init sched_init(void)
#endif
}
set_load_weight(&init_task, false);
set_load_weight(&init_task);
/*
* The boot idle thread does lazy MMU switching as well: