linux-kernel - Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in release

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <68b06558.050a0220.3db4df.0022.GAE@google.com>
Date: Thu, 28 Aug 2025 07:19:04 -0700
From: syzbot <syzbot+e5e64cdf8e92046dd3e1@...kaller.appspotmail.com>
To: qianqiang.liu@....com
Cc: qianqiang.liu@....com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in
 release_sock (2)

> #syz test

This crash does not have a reproducer. I cannot test it.

>
> --- a/net/bluetooth/af_bluetooth.c	2025-08-28 22:02:06
> +++ b/net/bluetooth/af_bluetooth.c	2025-08-28 22:13:46
> @@ -292,14 +292,12 @@
>  			 */
>  			goto restart;
>  		}
> -
> -		/* sk is safely in the parent list so reduce reference count */
> -		sock_put(sk);
>
>  		/* FIXME: Is this check still needed */
>  		if (sk->sk_state == BT_CLOSED) {
>  			bt_accept_unlink(sk);
>  			release_sock(sk);
> +			sock_put(sk);
>  			continue;
>  		}
>
> @@ -310,10 +308,12 @@
>  				sock_graft(sk, newsock);
>
>  			release_sock(sk);
> +			sock_put(sk);
>  			return sk;
>  		}
>
>  		release_sock(sk);
> +		sock_put(sk);
>  	}
>
>  	return NULL;
>
> -- 
> Best,
> Qianqiang Liu
>