linux-kernel - Re: [syzbot] [net?] WARNING in cleanup

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Message-ID: <20250221121653.2463-1-hdanton@sina.com>
Date: Fri, 21 Feb 2025 20:16:51 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+30a19e01a97420719891@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in cleanup_net (4)

On Thu, 20 Feb 2025 05:15:23 -0800
> syzbot found the following issue on:
> 
> HEAD commit:    6537cfb395f3 Merge tag 'sound-6.14-rc4' of git://git.kerne..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d89498580000

#syz test

--- x/include/net/net_namespace.h
+++ y/include/net/net_namespace.h
@@ -339,6 +339,7 @@ static inline void __netns_tracker_alloc
 					 bool refcounted,
 					 gfp_t gfp)
 {
+	get_net(net);
 #ifdef CONFIG_NET_NS_REFCNT_TRACKER
 	ref_tracker_alloc(refcounted ? &net->refcnt_tracker :
 				       &net->notrefcnt_tracker,
@@ -360,6 +361,7 @@ static inline void __netns_tracker_free(
        ref_tracker_free(refcounted ? &net->refcnt_tracker :
 				     &net->notrefcnt_tracker, tracker);
 #endif
+	put_net(net);
 }
 
 static inline struct net *get_net_track(struct net *net,
--