From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C024C761AF for ; Thu, 23 Mar 2023 00:40:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230057AbjCWAj6 (ORCPT ); Wed, 22 Mar 2023 20:39:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229964AbjCWAj5 (ORCPT ); Wed, 22 Mar 2023 20:39:57 -0400 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C028AE385 for ; Wed, 22 Mar 2023 17:39:54 -0700 (PDT) Received: by mail-io1-f70.google.com with SMTP id 9-20020a5ea509000000b0074ca36737d2so10598889iog.7 for ; Wed, 22 Mar 2023 17:39:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679531994; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=IaRX0pgESu9HWGk8g/PO1osl2nS+cMN0WgqbIcZnRUU=; b=gXjglVD/PrgxUuBwoXWLDhXY2VU5ZwIRnCzgMBVGr8aZB3dBhOXeHyKwr1wsk0kUat cgDN+8VpJwzyCkyfqf+qKV4FcgMOvYxq58nM+l2eYRTSdVLZDnDt6IfihN22oBx4Og9Q RyfvETPO67tW5UREP12MMsEmo8ciTCEckhAfThThrwvCaftIS2ft1vKyiUd9hjOXX+4g rb6YACmnjSwzeKbT9lNJqhkHjkIqGB9PO6636LNQnKWMDyNdKXqXbHYHfI57AFv0owxz B1egtEGlq4RUUxouxFgzqdMf/rX6GSfZDZGdKkvnIRkTHAUQ4K4liONzPydER260sBwp GVLA== X-Gm-Message-State: AO0yUKXeG7uOX/yTPyAGR9cra/CnkifxXhfrcdIl08AkVW+kD34gNe1t qT7HkZlyeq0cc541DlMqA8ZQe5P4kkENqme8eb9k8ff8ca/G X-Google-Smtp-Source: AK7set9HPan20YrTNHcdhFU26NpdqcY7CRhCZusJLZlh+ieMFlCVxTiMxE5CWXWLkPRjrw7nsMX1mK1hpBg7OzmToF6iUW44uFB2 MIME-Version: 1.0 X-Received: by 2002:a02:9485:0:b0:3be:81d3:5af3 with SMTP id x5-20020a029485000000b003be81d35af3mr3967436jah.3.1679531993978; Wed, 22 Mar 2023 17:39:53 -0700 (PDT) Date: Wed, 22 Mar 2023 17:39:53 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e3e09c05f78683a6@google.com> Subject: [syzbot] [arm-msm?] [net?] WARNING: refcount bug in qrtr_recvmsg (2) From: syzbot To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, mani@kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 9c1bec9c0b08 Merge tag 'linux-kselftest-fixes-6.3-rc3' of .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17285724c80000 kernel config: https://syzkaller.appspot.com/x/.config?x=6c84f77790aba2eb dashboard link: https://syzkaller.appspot.com/bug?extid=a7492efaa5d61b51db23 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c9f8a4c80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e8fe2cc80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eee5724f97b4/disk-9c1bec9c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/00ee10c4bc28/vmlinux-9c1bec9c.xz kernel image: https://storage.googleapis.com/syzbot-assets/42cf9c3e67cd/bzImage-9c1bec9c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a7492efaa5d61b51db23@syzkaller.appspotmail.com ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 0 PID: 46 at lib/refcount.c:25 refcount_warn_saturate+0x17c/0x1f0 lib/refcount.c:25 Modules linked in: CPU: 0 PID: 46 Comm: kworker/u4:3 Not tainted 6.3.0-rc2-syzkaller-00050-g9c1bec9c0b08 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Workqueue: qrtr_ns_handler qrtr_ns_worker RIP: 0010:refcount_warn_saturate+0x17c/0x1f0 lib/refcount.c:25 Code: 0a 31 ff 89 de e8 64 17 73 fd 84 db 0f 85 2e ff ff ff e8 47 1b 73 fd 48 c7 c7 e0 6a a6 8a c6 05 5d 73 52 0a 01 e8 e4 94 3b fd <0f> 0b e9 0f ff ff ff e8 28 1b 73 fd 0f b6 1d 47 73 52 0a 31 ff 89 RSP: 0018:ffffc90000b779d8 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888017d61d40 RSI: ffffffff814b6037 RDI: 0000000000000001 RBP: ffff88802717ec98 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888145178000 R13: ffff88802717ec00 R14: ffff8880280b1030 R15: ffff8880280b1034 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffdb2009388 CR3: 0000000029dad000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __refcount_add include/linux/refcount.h:199 [inline] __refcount_inc include/linux/refcount.h:250 [inline] refcount_inc include/linux/refcount.h:267 [inline] kref_get include/linux/kref.h:45 [inline] qrtr_node_acquire net/qrtr/af_qrtr.c:202 [inline] qrtr_node_lookup net/qrtr/af_qrtr.c:398 [inline] qrtr_send_resume_tx net/qrtr/af_qrtr.c:1003 [inline] qrtr_recvmsg+0x85f/0x990 net/qrtr/af_qrtr.c:1070 sock_recvmsg_nosec net/socket.c:1017 [inline] sock_recvmsg+0xe2/0x160 net/socket.c:1038 qrtr_ns_worker+0x170/0x1700 net/qrtr/ns.c:688 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches