From nobody Tue Sep 16 08:46:13 2025 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 372C2C4708D for ; Wed, 4 Jan 2023 20:08:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239561AbjADUIq (ORCPT ); Wed, 4 Jan 2023 15:08:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56788 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239774AbjADUIY (ORCPT ); Wed, 4 Jan 2023 15:08:24 -0500 Received: from mail-yb1-xb32.google.com (mail-yb1-xb32.google.com [IPv6:2607:f8b0:4864:20::b32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3F6811C19 for ; Wed, 4 Jan 2023 12:08:00 -0800 (PST) Received: by mail-yb1-xb32.google.com with SMTP id 192so37827653ybt.6 for ; Wed, 04 Jan 2023 12:08:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=2BpLJr+Yx20N63OuZrSWnIJ9uSTdI4PPQVV/gfLgc40=; b=vs1GwV9bxf64lqjj/kWvqmFvLa5RwKxJQjA+1MM3wf+kil0DBTiNIORB1SIX4ygP2q 6Nu6hRI2Zs3pz/GM/o+36qzYKRUC+2Bd+sKabdsgPqb/y9VmZ1SOp5USxQEL42q3pszY LjK7fLpc5NvfNQB55DhII+BhROuse6DWGK0nBt+QYZiZKa5VTBkei3jUu68WvsYAV2mF uT/tWIZXRyStlf14YidBHKu2AgduaI9YIjTbB25Ia0JO2CFjZ5HMUFmfjswlxvEP9WRJ bdI5fDnkrV+TViJ/vdAZZz1toV4xoOUICM4dAhAByjVVh8ZMB6xAE+S2PTAY2AQnBbke LRpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=2BpLJr+Yx20N63OuZrSWnIJ9uSTdI4PPQVV/gfLgc40=; b=OqE6fbF2bLXHXR8cMVeRMXwEXPvMG8mkpnBqhwFd/01B6+7wkjVgh7zW6WH67+io17 S2r8FmJ+T6Duqdbd27ftQrNx8hLtXGSW9J9h6nuJTVNlFJ0+d1F7hMZh6kgCUgqAXXta fgujF/gxpjLklI3VUPEMG1sLrnZdRQQ/rQcAWy8LzQooFGUxKMxHUMPhED2Ze89PUjSJ PC0FJlw17Nsfuskl92ckw66DSnmtwtrtColqOmeNDDKWlvs7nIaX6nvZAJiFOWn9AsUF rUzvTJJCi64oQye5r5fKszTpI3N6EYhmXR6SRDeKaa/yd4oNRwSfog8LkoeNh+UGUoXs DwTQ== X-Gm-Message-State: AFqh2krab/7Lt6U5xvxdSFLgxKLG25rWMzrnML0EC/eb/AvoheT3v3to SeI6KblU6G1f0bquhOCQK4RF9A== X-Google-Smtp-Source: AMrXdXvFnWP23hqMJnFc9ic6gBF8u9t2DcaJ0f48JU7N8FSqvoH8H/OOJ+2VkMhZwxOV5LIvfK/N5Q== X-Received: by 2002:a5b:b8f:0:b0:79b:4165:c8ce with SMTP id l15-20020a5b0b8f000000b0079b4165c8cemr12978682ybq.14.1672862879914; Wed, 04 Jan 2023 12:07:59 -0800 (PST) Received: from n217-072-012.byted.org ([147.160.184.123]) by smtp.gmail.com with ESMTPSA id bs32-20020a05620a472000b007049f19c736sm24551707qkb.7.2023.01.04.12.07.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Jan 2023 12:07:59 -0800 (PST) From: Bobby Eshleman Cc: Bobby Eshleman , Bobby Eshleman , Cong Wang , Jiang Wang , Krasnov Arseniy , syzbot+30b72abaa17c07fe39dd@syzkaller.appspotmail.com, Stefan Hajnoczi , Stefano Garzarella , "Michael S. Tsirkin" , Jason Wang , Paolo Abeni , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] vhost/vsock: check length in rx header Date: Wed, 4 Jan 2023 20:06:41 +0000 Message-Id: <20230104200642.4071622-1-bobby.eshleman@bytedance.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Check that the rx packet length indicated by the header does not exceed the iov length. Fixes: b68396fad17f ("virtio/vsock: replace virtio_vsock_pkt with sk_buff") Reported-by: syzbot+30b72abaa17c07fe39dd@syzkaller.appspotmail.com Signed-off-by: Bobby Eshleman --- drivers/vhost/vsock.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index 982ca479c659..84dec9ac62c1 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -365,8 +365,9 @@ vhost_vsock_alloc_skb(struct vhost_virtqueue *vq, if (!payload_len) return skb; =20 - /* The pkt is too big */ - if (payload_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { + /* The pkt is too big or the length in the header is invalid */ + if (payload_len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE || + payload_len > len) { kfree_skb(skb); return NULL; } --=20 2.20.1