linux-kernel - [PATCH 4.19 73/74] net_sched: fix a crash in tc_new

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Date:   Mon, 13 Dec 2021 10:30:44 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+37b8770e6d5a8220a039@...kaller.appspotmail.com,
        Cong Wang <xiyou.wangcong@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 73/74] net_sched: fix a crash in tc_new_tfilter()

From: Cong Wang <xiyou.wangcong@...il.com>

commit 460b360104d51552a57f39e54b2589c9fd7fa0b3 upstream.

When tcf_block_find() fails, it already rollbacks the qdisc refcnt,
so its caller doesn't need to clean up this again. Avoid calling
qdisc_put() again by resetting qdisc to NULL for callers.

Reported-by: syzbot+37b8770e6d5a8220a039@...kaller.appspotmail.com
Fixes: e368fdb61d8e ("net: sched: use Qdisc rcu API instead of relying on rtnl lock")
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/cls_api.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -629,8 +629,10 @@ static struct tcf_block *tcf_block_find(
 errout_rcu:
 	rcu_read_unlock();
 errout_qdisc:
-	if (*q)
+	if (*q) {
 		qdisc_put(*q);
+		*q = NULL;
+	}
 	return ERR_PTR(err);
 }