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Mon, 21 Sep 2020 07:34:46 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-195-cjvjHyuBMWin_TUWieMutg-1; Mon, 21 Sep 2020 07:34:41 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DDF721084D6B for ; Mon, 21 Sep 2020 11:34:40 +0000 (UTC) Received: from localhost (ovpn-112-39.ams2.redhat.com [10.36.112.39]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9F8285C1D0; Mon, 21 Sep 2020 11:34:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600688083; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PTZ8mzkVrbwLph5v42RvSwqkctWB20tlLXNi2SU46d4=; b=Zyxo6VO7d2B84uWwKTyBWaOvimkS+VMmrv2A17QaZDQ0ZLkJ6+w703HbMwrG0H/MS1MlBv 9nQHzEYJ9SXbTGNyrT+sfQhZ5GKemGCeHtsf19pity8nUOmJC8etwxaligNl/nQ5vrgSJX VzAo8wUvuoaMvCuEvI7apqbArGX+Mbo= X-MC-Unique: cjvjHyuBMWin_TUWieMutg-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH 1/2] libvhost-user: return early on virtqueue errors Date: Mon, 21 Sep 2020 12:34:19 +0100 Message-Id: <20200921113420.154378-2-stefanha@redhat.com> In-Reply-To: <20200921113420.154378-1-stefanha@redhat.com> References: <20200921113420.154378-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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; 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Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" vu_panic() is not guaranteed to exit the program. Return early when errors are encountered. Note that libvhost-user does not have an "unmap" operation for mapped descriptors. Therefore it is correct to return without explicit cleanup. Signed-off-by: Stefan Hajnoczi Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- contrib/libvhost-user/libvhost-user.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/= libvhost-user.c index 53f16bdf08..27626e629a 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -2407,7 +2407,7 @@ vu_queue_set_notification(VuDev *dev, VuVirtq *vq, in= t enable) } } =20 -static void +static bool virtqueue_map_desc(VuDev *dev, unsigned int *p_num_sg, struct iovec *iov, unsigned int max_num_sg, bool is_write, @@ -2419,7 +2419,7 @@ virtqueue_map_desc(VuDev *dev, =20 if (!sz) { vu_panic(dev, "virtio: zero sized buffers are not allowed"); - return; + return false; } =20 while (sz) { @@ -2427,13 +2427,13 @@ virtqueue_map_desc(VuDev *dev, =20 if (num_sg =3D=3D max_num_sg) { vu_panic(dev, "virtio: too many descriptors in indirect table"= ); - return; + return false; } =20 iov[num_sg].iov_base =3D vu_gpa_to_va(dev, &len, pa); if (iov[num_sg].iov_base =3D=3D NULL) { vu_panic(dev, "virtio: invalid address for buffers"); - return; + return false; } iov[num_sg].iov_len =3D len; num_sg++; @@ -2442,6 +2442,7 @@ virtqueue_map_desc(VuDev *dev, } =20 *p_num_sg =3D num_sg; + return true; } =20 static void * @@ -2479,6 +2480,7 @@ vu_queue_map_desc(VuDev *dev, VuVirtq *vq, unsigned i= nt idx, size_t sz) if (desc[i].flags & VRING_DESC_F_INDIRECT) { if (desc[i].len % sizeof(struct vring_desc)) { vu_panic(dev, "Invalid size for indirect buffer table"); + return NULL; } =20 /* loop over the indirect descriptor table */ @@ -2506,22 +2508,27 @@ vu_queue_map_desc(VuDev *dev, VuVirtq *vq, unsigned= int idx, size_t sz) /* Collect all the descriptors */ do { if (desc[i].flags & VRING_DESC_F_WRITE) { - virtqueue_map_desc(dev, &in_num, iov + out_num, - VIRTQUEUE_MAX_SIZE - out_num, true, - desc[i].addr, desc[i].len); + if (!virtqueue_map_desc(dev, &in_num, iov + out_num, + VIRTQUEUE_MAX_SIZE - out_num, true, + desc[i].addr, desc[i].len)) { + return NULL; + } } else { if (in_num) { vu_panic(dev, "Incorrect order for descriptors"); return NULL; } - virtqueue_map_desc(dev, &out_num, iov, - VIRTQUEUE_MAX_SIZE, false, - desc[i].addr, desc[i].len); + if (!virtqueue_map_desc(dev, &out_num, iov, + VIRTQUEUE_MAX_SIZE, false, + desc[i].addr, desc[i].len)) { + return NULL; + } } =20 /* If we've got too many, that implies a descriptor loop. */ if ((in_num + out_num) > max) { vu_panic(dev, "Looped descriptor"); + return NULL; } rc =3D virtqueue_read_next_desc(dev, desc, i, max, &i); } while (rc =3D=3D VIRTQUEUE_READ_DESC_MORE); --=20 2.26.2 From nobody Sun May 19 01:26:39 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1600688499; cv=none; d=zohomail.com; s=zohoarc; b=ISGIWfjJm5lK9EjZEYeTt1UBPrMdvtC0ToRh56BP+QmWEDbbe5V5JxlACLbfkKM7OcGy1uCYWanEnSGJFkalXUf1Tk1IIZFzTpOQokCaUmNqQ37eeeaNIgwIQgRoer3nSn7CB/MFiBx4AE4LXPbLiPTcChW0fqQLL7WdaupZ7Tw= ARC-Message-Signature: i=1; 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Mon, 21 Sep 2020 11:34:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600688095; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5dmk58Gzs/ellAaqhm8wYnKQ4lg8lRQmB9s1pLeHYQ4=; b=CtVRLzXY7yQyFoFFbb4FlsLVfj5xH5Oz0o1wSWj8O9r6QCvKMSyAAxhSh3ZJnd6enmXGE7 pIhzcnFoBjN56xsVCVknd1zxFfuIdMQWwvkYLDQ7vCuJWChe6NSMGKy71wOLgQ7uoeIo7f LLp0+GsW3oYZ+2smznOoGKTRusd4Y8w= X-MC-Unique: 3kX45oceOJu3kkVvF7Triw-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH 2/2] libvhost-user: return on error in vu_log_queue_fill() Date: Mon, 21 Sep 2020 12:34:20 +0100 Message-Id: <20200921113420.154378-3-stefanha@redhat.com> In-Reply-To: <20200921113420.154378-1-stefanha@redhat.com> References: <20200921113420.154378-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; 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Tsirkin" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" vu_panic() is not guaranteed to exit the program. Return early when errors are encountered. Signed-off-by: Stefan Hajnoczi Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- contrib/libvhost-user/libvhost-user.c | 1 + 1 file changed, 1 insertion(+) diff --git a/contrib/libvhost-user/libvhost-user.c b/contrib/libvhost-user/= libvhost-user.c index 27626e629a..1fc2cb12ce 100644 --- a/contrib/libvhost-user/libvhost-user.c +++ b/contrib/libvhost-user/libvhost-user.c @@ -2722,6 +2722,7 @@ vu_log_queue_fill(VuDev *dev, VuVirtq *vq, if (desc[i].flags & VRING_DESC_F_INDIRECT) { if (desc[i].len % sizeof(struct vring_desc)) { vu_panic(dev, "Invalid size for indirect buffer table"); + return; } =20 /* loop over the indirect descriptor table */ --=20 2.26.2