From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail115-63.sinamail.sina.com.cn (mail115-63.sinamail.sina.com.cn [218.30.115.63]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A96961E522 for ; Sun, 8 Sep 2024 12:50:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=218.30.115.63 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725799844; cv=none; b=cZfIJ2Qc3wActFcklWeKBbm0yc7ZxRcvzsJLbcehQCpzQESq6IpOQQdj4KuVcBVzit+bS+Wp21Bz6cmITYihWNSUatIWKozuQxbDB1BEjjIhGPo6emSQ+jsQsDzqZ02jj+yILK0gy+FuhOp2FFDtVeG/MxyD3MBUC4jrqVTtlcE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725799844; c=relaxed/simple; bh=hefThDtLX/Nk4YNwotWsCwXdIafqr3DbVSdifcpl4UA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=pN63xGgU7Ehc5lReMnJONUUKilpPdBNf2538a2niYQ0l7fL5qPhhc73rHMN0T4BsA+GZZrGrv+ljkzMozsqd6EuM1HZen+Ojl6T2sdAHYNeOUM7lCj/33YRMeh7Eb9tDcioXO+PF6SJNgk2tkBroxD+Go/nqJKKZUIF5ZpJRZDg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; arc=none smtp.client-ip=218.30.115.63 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([113.118.65.196]) by sina.com (10.185.250.22) with ESMTP id 66DD9D9300001051; Sun, 8 Sep 2024 20:50:29 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 4317947602730 X-SMAIL-UIID: 1A63C8FDD5254558BEAF2C745CED631C-20240908-205029-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in l2cap_connect (2) Date: Sun, 8 Sep 2024 20:50:17 +0800 Message-Id: <20240908125017.2529-1-hdanton@sina.com> In-Reply-To: <0000000000004a130a0621888811@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On Sat, 07 Sep 2024 07:42:26 -0700 > syzbot has found a reproducer for the following issue on: > > HEAD commit: 788220eee30d Merge tag 'pm-6.11-rc7' of git://git.kernel.o.. > git tree: upstream > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1304189f980000 #syz test --- x/net/bluetooth/hci_core.c +++ y/net/bluetooth/hci_core.c @@ -3787,8 +3787,10 @@ static void hci_acldata_packet(struct hc if (conn) { hci_conn_enter_active_mode(conn, BT_POWER_FORCE_ACTIVE_OFF); + hci_req_sync_lock(hdev); /* Send to upper protocol */ l2cap_recv_acldata(conn, skb, flags); + hci_req_sync_unlock(hdev); return; } else { bt_dev_err(hdev, "ACL packet for unknown connection handle %d", --