From nobody Thu Nov 28 10:42:34 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1694167191422152.4363927390698; Fri, 8 Sep 2023 02:59:51 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qeYFX-0003K4-Tb; Fri, 08 Sep 2023 05:58:04 -0400 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 1qeYFB-0002Nb-TZ; Fri, 08 Sep 2023 05:57:44 -0400 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qeYF7-000777-S9; Fri, 08 Sep 2023 05:57:40 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id B2CB2200DE; Fri, 8 Sep 2023 12:56:49 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id A8FF026925; Fri, 8 Sep 2023 12:56:00 +0300 (MSK) Received: (nullmailer pid 276006 invoked by uid 1000); Fri, 08 Sep 2023 09:55:56 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-trivial@nongnu.org, Thomas Huth , qemu-stable@nongnu.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Michael Tokarev Subject: [PULL 22/23] hw/net/vmxnet3: Fix guest-triggerable assert() Date: Fri, 8 Sep 2023 12:55:19 +0300 Message-Id: <20230908095520.275866-23-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230908095520.275866-1-mjt@tls.msk.ru> References: <20230908095520.275866-1-mjt@tls.msk.ru> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1694167191964100001 From: Thomas Huth The assert() that checks for valid MTU sizes can be triggered by the guest (e.g. with the reproducer code from the bug ticket https://gitlab.com/qemu-project/qemu/-/issues/517 ). Let's avoid this problem by simply logging the error and refusing to activate the device instead. Fixes: d05dcd94ae ("net: vmxnet3: validate configuration values during acti= vate") Signed-off-by: Thomas Huth Cc: qemu-stable@nongnu.org Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Michael Tokarev [Mjt: change format specifier from %d to %u for uint32_t argument] --- hw/net/vmxnet3.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c index 5dfacb1098..3fb108751a 100644 --- a/hw/net/vmxnet3.c +++ b/hw/net/vmxnet3.c @@ -1439,7 +1439,10 @@ static void vmxnet3_activate_device(VMXNET3State *s) vmxnet3_setup_rx_filtering(s); /* Cache fields from shared memory */ s->mtu =3D VMXNET3_READ_DRV_SHARED32(d, s->drv_shmem, devRead.misc.mtu= ); - assert(VMXNET3_MIN_MTU <=3D s->mtu && s->mtu <=3D VMXNET3_MAX_MTU); + if (s->mtu < VMXNET3_MIN_MTU || s->mtu > VMXNET3_MAX_MTU) { + qemu_log_mask(LOG_GUEST_ERROR, "vmxnet3: Bad MTU size: %u\n", s->m= tu); + return; + } VMW_CFPRN("MTU is %u", s->mtu); =20 s->max_rx_frags =3D --=20 2.39.2