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

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Date: Mon, 27 May 2024 07:27:50 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+2459c1b9fcd39be822b1@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [net?] WARNING in inet_csk_get_port (3)

On Mon, 06 May 2024 01:37:21 -0700
> syzbot found the following issue on:
> 
> HEAD commit:    977b1ef51866 Merge tag 'block-6.9-20240420' of git://git.k..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11135520980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  977b1ef51866

--- x/net/ipv4/inet_connection_sock.c
+++ y/net/ipv4/inet_connection_sock.c
@@ -589,7 +589,7 @@ int inet_csk_get_port(struct sock *sk, u
 success:
 	inet_csk_update_fastreuse(tb, sk);
 
-	if (!inet_csk(sk)->icsk_bind_hash)
+	if (tb != inet_csk(sk)->icsk_bind_hash)
 		inet_bind_hash(sk, tb, tb2, port);
 	WARN_ON(inet_csk(sk)->icsk_bind_hash != tb);
 	WARN_ON(inet_csk(sk)->icsk_bind2_hash != tb2);
--