From nobody Sat Feb 7 21:08:11 2026 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E14A1145355 for ; Mon, 3 Nov 2025 05:49:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.197 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762148966; cv=none; b=fnKZecIhl91nsatohQRQ9hDkZieI7U4tzafxxZykDzeoxGUJDxUGr5LaWnvW8zExRdweWFQf+V+sf9NxowYK2VWigABPPvoIJKIXXgvJCfDu8KVVmsRQc5yFeQ0xsb7RapSQgCFdublgOMtFbEMREu3qPVy7y7r9zyoEBtG1x+w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762148966; c=relaxed/simple; bh=+KFj5rGnHv27vIKb5+keI4itoupavrQMKtAXgOjiUmw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=RQc7hZwBdaVXSHFwedQZnQjB1BPeiCzRkfBwRQquSrSRggIbrYRohK/gIW/SG7ZeHQzmwPNWDVXwbEmcfI/l8pxEXAS1RVbZLc5PlGhjWkJ6whB30V9q66mYwqTN3ffjqT3Kv/oFwdZvnsO/ceg4xeUN+b2vSNB5JnOjVKA7QkA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f197.google.com with SMTP id e9e14a558f8ab-4330ead8432so26459585ab.0 for ; Sun, 02 Nov 2025 21:49:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1762148964; x=1762753764; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=FWCdtFeRiTYHHo48qr1uxFIsc2bW5Uiytm2WAQQjOmg=; b=L1XAVZbPASDqbQeCsmSoWOEb0xcXX9DbOClWa1EjqsHaWUUCYa44GK7U3vd07aopLS rKZS5EZ1ncSsxdp83kg48oS+zhM4CrDhcKxlv0fb8wNS8zJXDXO54OQQeoGWs13N0hOH fIwB2CF7vLTCQTVeKcYlr716jSIB6HrEX3A8tXQ8oyll7gqxpalZFpCy9UUszv1BpOT6 lnbaf7NEBh4L3OYFGAoWtkvDUPoTtsdMxjcHiAXtQmNSTcHP2n37kkjG+IUZspVtBw2O TFI4nxWDaa4MQB5R+hwtsnZSXfyah/pxP9qRK5b70q5rbtBtuBZ/PjXrS7bSksySwC6D Em2w== X-Gm-Message-State: AOJu0YzV+uez1YY0pMBxf6KNyIrqgk2qrvB5HfDdQR0gN7aLRqPyGSIp Iunt3+F/2e27lbQZzDoidRvVsrFxPATjHYl6Kpp6s1CZttJbrFLOKDccxuplOm9KJhBCnzUDjbD 9PMGlrKynexFZMu4wt04/DzgEuF29lFAMo071pQQtGxin6GD/OiRFY69vgFY= X-Google-Smtp-Source: AGHT+IHaKhOyfP00wH32DhPeXxAXQpubqqgptzhFctVL7oDnEfLQdgvsmU1tHW/9H+v+BGNNa2Eg3ONeAIu72b66cE0OCq9rD4A8 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:398e:b0:433:290f:c201 with SMTP id e9e14a558f8ab-433290fc2c0mr58954985ab.11.1762148964051; Sun, 02 Nov 2025 21:49:24 -0800 (PST) Date: Sun, 02 Nov 2025 21:49:24 -0800 In-Reply-To: <6907edce.a70a0220.37351b.0014.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69084264.050a0220.29fc44.0033.GAE@google.com> Subject: Forwarded: Re: [syzbot] [nbd?] KASAN: slab-use-after-free Write in recv_work (3) From: syzbot To: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [nbd?] KASAN: slab-use-after-free Write in recv_work = (3) Author: lizhi.xu@windriver.com #syz test diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index a853c65ac65d..d5de9bac68f1 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -1024,9 +1024,9 @@ static void recv_work(struct work_struct *work) nbd_mark_nsock_dead(nbd, nsock, 1); mutex_unlock(&nsock->tx_lock); =20 - nbd_config_put(nbd); atomic_dec(&config->recv_threads); wake_up(&config->recv_wq); + nbd_config_put(nbd); kfree(args); } =20 @@ -1540,7 +1540,10 @@ static int nbd_start_device(struct nbd_device *nbd) args->index =3D i; queue_work(nbd->recv_workq, &args->work); } - return nbd_set_size(nbd, config->bytesize, nbd_blksize(config)); + error =3D nbd_set_size(nbd, config->bytesize, nbd_blksize(config)); + if (error) + flush_workqueue(nbd->recv_workq); + return error; } =20 static int nbd_start_device_ioctl(struct nbd_device *nbd) @@ -2355,6 +2358,7 @@ static int nbd_genl_reconfigure(struct sk_buff *skb, = struct genl_info *info) } mutex_unlock(&nbd_index_mutex); =20 + mutex_lock(&nbd->config_lock); config =3D nbd_get_config_unlocked(nbd); if (!config) { dev_err(nbd_to_dev(nbd), @@ -2363,7 +2367,6 @@ static int nbd_genl_reconfigure(struct sk_buff *skb, = struct genl_info *info) return -EINVAL; } =20 - mutex_lock(&nbd->config_lock); if (!test_bit(NBD_RT_BOUND, &config->runtime_flags) || !nbd->pid) { dev_err(nbd_to_dev(nbd),