linux-kernel - [PATCH] net: sched: fix a error path in fw

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Date:   Thu,  1 Dec 2022 23:15:32 +0800
From:   Li Qiong <liqiong@...china.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yu Zhe <yuzhe@...china.com>, Li Qiong <liqiong@...china.com>
Subject: [PATCH] net: sched: fix a error path in fw_change()

The 'pfp' pointer could be null if can't find the target filter.
Check 'pfp' pointer and fix this error path.

Signed-off-by: Li Qiong <liqiong@...china.com>
---
 net/sched/cls_fw.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index a32351da968c..b898e4a81146 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -289,6 +289,12 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
 			if (pfp == f)
 				break;
 
+		if (!pfp) {
+			tcf_exts_destroy(&fnew->exts);
+			kfree(fnew);
+			return err;
+		}
+
 		RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
 		rcu_assign_pointer(*fp, fnew);
 		tcf_unbind_filter(tp, &f->res);
-- 
2.11.0