From patchwork Mon Feb 5 17:26:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 13545904 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3EC5CC4828D for ; Mon, 5 Feb 2024 17:28:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rX2kW-0008Tk-Af; Mon, 05 Feb 2024 12:27:16 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rX2kU-0008Si-9h for qemu-devel@nongnu.org; Mon, 05 Feb 2024 12:27:14 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rX2kS-0006Oa-8G for qemu-devel@nongnu.org; Mon, 05 Feb 2024 12:27:14 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707154031; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iAGCvQx28RrLJakkek/T62S1VRBhS+KJNVJlhZaHy24=; b=fp9E2h9lDB4aJMuN59DtNnyPKIw4VUdFRwNVDvH8Dey1fRFwvVMvtPpp9Eu/3zVSPSC8UF 3QSNHNOeT+nzXm5AiGV81Dk8vk7nTe+hv6DgtJCIXzTfoOvZSXy9bhS9dAjq0LpioQbtrR eRoniCDsM2CpOMpBPPU3ibGaFdW60v8= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-6-qU1hgiJTOumHvQJHYM0ajw-1; Mon, 05 Feb 2024 12:27:09 -0500 X-MC-Unique: qU1hgiJTOumHvQJHYM0ajw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C2CD2299E741; Mon, 5 Feb 2024 17:27:08 +0000 (UTC) Received: from localhost (unknown [10.39.192.69]) by smtp.corp.redhat.com (Postfix) with ESMTP id 339541C060AF; Mon, 5 Feb 2024 17:27:07 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: Kevin Wolf , Hanna Reitz , "Michael S. Tsirkin" , Michael Roth , Markus Armbruster , Stefan Hajnoczi , qemu-block@nongnu.org Subject: [PATCH 3/5] virtio-blk: add vq_rq[] bounds check in virtio_blk_dma_restart_cb() Date: Mon, 5 Feb 2024 12:26:57 -0500 Message-ID: <20240205172659.476970-4-stefanha@redhat.com> In-Reply-To: <20240205172659.476970-1-stefanha@redhat.com> References: <20240205172659.476970-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.7 Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.285, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Hanna Czenczek noted that the array index in virtio_blk_dma_restart_cb() is not bounds-checked: g_autofree VirtIOBlockReq **vq_rq = g_new0(VirtIOBlockReq *, num_queues); ... while (rq) { VirtIOBlockReq *next = rq->next; uint16_t idx = virtio_get_queue_index(rq->vq); rq->next = vq_rq[idx]; ^^^^^^^^^^ The code is correct because both rq->vq and vq_rq[] depend on num_queues, but this is indirect and not 100% obvious. Add an assertion. Suggested-by: Hanna Czenczek Signed-off-by: Stefan Hajnoczi Reviewed-by: Manos Pitsidianakis Reviewed-by: Hanna Czenczek --- hw/block/virtio-blk.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/block/virtio-blk.c b/hw/block/virtio-blk.c index a0735a9bca..f3193f4b75 100644 --- a/hw/block/virtio-blk.c +++ b/hw/block/virtio-blk.c @@ -1209,6 +1209,7 @@ static void virtio_blk_dma_restart_cb(void *opaque, bool running, VirtIOBlockReq *next = rq->next; uint16_t idx = virtio_get_queue_index(rq->vq); + assert(idx < num_queues); rq->next = vq_rq[idx]; vq_rq[idx] = rq; rq = next;