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net: sched: consistently use rcu_replace_pointer() in taprio_change()

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[ Upstream commit d5c4546062 ]

According to Vinicius (and carefully looking through the whole
https://syzkaller.appspot.com/bug?extid=b65e0af58423fc8a73aa
once again), txtime branch of 'taprio_change()' is not going to
race against 'advance_sched()'. But using 'rcu_replace_pointer()'
in the former may be a good idea as well.

Suggested-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dmitry Antipov 2024-09-04 14:54:01 +03:00 committed by Greg Kroah-Hartman
parent 3f5625e9e9
commit 37a6fc0d8f
1 changed files with 3 additions and 1 deletions
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4
net/sched/sch_taprio.c
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@ -1975,7 +1975,9 @@ static int taprio_change(struct Qdisc *sch, struct nlattr *opt,
goto unlock;
}
rcu_assign_pointer(q->admin_sched, new_admin);
/* Not going to race against advance_sched(), but still */
admin = rcu_replace_pointer(q->admin_sched, new_admin,
lockdep_rtnl_is_held());
if (admin)
call_rcu(&admin->rcu, taprio_free_sched_cb);
} else {