[tip: sched/urgent] sched/eevdf: Fix heap corruption more

[tip-bot2 for Peter Zijlstra]

The following commit has been merged into the sched/urgent branch of tip:

Commit-ID:     d2929762cc3f85528b0ca12f6f63c2a714f24778
Gitweb:        https://git.kernel.org/tip/d2929762cc3f85528b0ca12f6f63c2a714f24778
Author:        Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate:    Tue, 17 Oct 2023 16:59:47 +02:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 18 Oct 2023 10:22:13 +02:00

sched/eevdf: Fix heap corruption more

Because someone is a flaming idiot... and forgot we have current as
se->on_rq but not actually in the tree itself, and walking rb_parent()
on an entry not in the tree is 'funky' and KASAN complains.

Fixes: 8dafa9d0eb1a ("sched/eevdf: Fix min_deadline heap integrity")
Reported-by: 0599jiangyc@xxxxxxxxx
Reported-by: Dmitry Safonov <0x7f454c46@xxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Dmitry Safonov <0x7f454c46@xxxxxxxxx>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218020
Link: https://lkml.kernel.org/r/CAJwJo6ZGXO07%3DQvW4fgQfbsDzQPs9xj5sAQ1zp%3DmAyPMNbHYww%40mail.gmail.com
---
 kernel/sched/fair.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 061a30a..df348aa 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3657,7 +3657,8 @@ static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
 		 */
 		deadline = div_s64(deadline * old_weight, weight);
 		se->deadline = se->vruntime + deadline;
-		min_deadline_cb_propagate(&se->run_node, NULL);
+		if (se != cfs_rq->curr)
+			min_deadline_cb_propagate(&se->run_node, NULL);
 	}
 
 #ifdef CONFIG_SMP