From nobody Mon Feb 9 16:04:13 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; 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=pass(p=quarantine dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1769516695; cv=none; d=zohomail.com; s=zohoarc; b=N6F/OuQUoDkftoC1Jy0BnVwL/vMgFyApORh7/E+gX4j5KiJFR3R5g6w2YKTRqeQ06sEGpqHmWpIAcTyQGf6sBABAllsIPE0bHv5CHa5BsdW6SaGHVCpvzQa6MXgXdMrpDrwmMvd2+CagO1XpVk4sSFF9/2YbOLCcjbnsc1Wnq4E= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1769516695; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=QQsQZrTXRZwk9UKwFYpdWyra0EJs/HCRXIBDvmZvm/c=; b=J1dmqbT9JZlk6Hzuz8kbecGTgBGhHDuVEB/SHXLpFDZLB9lwbyWw4i/QjNYqZYrX+AWQYgm/bqtIJSxGXfTHNRnzWOfRWp7XwNbGcw4s7Zynouy4WFSCjUmtmPLxIvA6wCHGRBAvreyXksOS2T+7Zt9ikNiRBldWsq1wlfmLIZY= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; 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=pass header.from= (p=quarantine dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1769516695826539.0208340637552; Tue, 27 Jan 2026 04:24:55 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vki7H-0007lw-3F; Tue, 27 Jan 2026 07:24:19 -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 1vki7G-0007lR-B3 for qemu-devel@nongnu.org; Tue, 27 Jan 2026 07:24:18 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vki7C-0003bt-Tj for qemu-devel@nongnu.org; Tue, 27 Jan 2026 07:24:18 -0500 Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-167-MofKZM0wNquxt7vy-dxL6w-1; Tue, 27 Jan 2026 07:24:08 -0500 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (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 mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B99D01944DFF; Tue, 27 Jan 2026 12:24:06 +0000 (UTC) Received: from localhost (unknown [10.45.242.23]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id E69071800240; Tue, 27 Jan 2026 12:24:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769516651; 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; bh=QQsQZrTXRZwk9UKwFYpdWyra0EJs/HCRXIBDvmZvm/c=; b=SW6JjeQm+AtgZLYG22vRuRyPVvp74Cy9TE2CJp1rNB6YDY/xCnhjb1FPEqI3034XR1LKdL 1JXAvU02D8fc9MUcVS7U9T1jK2X/TY52XsJH/6bxjKwFTeyCOebmEjCmzgilt+MjMquAs8 oIN0nCfTURNmkTuOKLvu4GCox4bsoMs= X-MC-Unique: MofKZM0wNquxt7vy-dxL6w-1 X-Mimecast-MFC-AGG-ID: MofKZM0wNquxt7vy-dxL6w_1769516647 From: marcandre.lureau@redhat.com To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , "Michael S. Tsirkin" , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Akihiko Odaki , Dmitry Osipenko Subject: [PATCH] rutabaga: improve error handling, fix potential crash during init Date: Tue, 27 Jan 2026 16:24:00 +0400 Message-ID: <20260127122400.100384-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 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=170.10.129.124; envelope-from=marcandre.lureau@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H2=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-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: qemu development 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-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1769516698121154100 From: Marc-Andr=C3=A9 Lureau When virtio_gpu_rutabaga_get_num_capsets() returns 0, virtio_init() isn't called and the device later crashes during realize. =3D=3D72545=3D=3DERROR: AddressSanitizer: SEGV on unknown address 0x0000000= 00000 (pc 0x556ad6f7ba9e bp 0x7ffe6958f810 sp 0x7ffe6958f7e0 T0) =3D=3D72545=3D=3DThe signal is caused by a READ memory access. =3D=3D72545=3D=3DHint: address points to the zero page. #0 0x556ad6f7ba9e in virtio_memory_listener_commit ../hw/virtio/virtio.c:40= 34 #1 0x556ad6a24c96 in listener_add_address_space ../system/memory.c:3128 #2 0x556ad6a25d15 in memory_listener_register ../system/memory.c:3216 #3 0x556ad6f7bf11 in virtio_device_realize ../hw/virtio/virtio.c:4075 Rework error handling of the function to set Error appropriately. 0 capset may be ok now. Signed-off-by: Marc-Andr=C3=A9 Lureau Reviewed-by: Akihiko Odaki Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/display/virtio-gpu-rutabaga.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/hw/display/virtio-gpu-rutabaga.c b/hw/display/virtio-gpu-rutab= aga.c index ed5ae52acbe..ebb6c783fb0 100644 --- a/hw/display/virtio-gpu-rutabaga.c +++ b/hw/display/virtio-gpu-rutabaga.c @@ -1032,19 +1032,19 @@ static bool virtio_gpu_rutabaga_init(VirtIOGPU *g, = Error **errp) return true; } =20 -static int virtio_gpu_rutabaga_get_num_capsets(VirtIOGPU *g) +static bool +virtio_gpu_rutabaga_get_num_capsets(VirtIOGPU *g, uint32_t *num_capsets, E= rror **errp) { int result; - uint32_t num_capsets; VirtIOGPURutabaga *vr =3D VIRTIO_GPU_RUTABAGA(g); =20 - result =3D rutabaga_get_num_capsets(vr->rutabaga, &num_capsets); + result =3D rutabaga_get_num_capsets(vr->rutabaga, num_capsets); if (result) { - error_report("Failed to get capsets"); - return 0; + error_setg_errno(errp, -result, "Failed to get num_capsets"); + return false; } - vr->num_capsets =3D num_capsets; - return num_capsets; + vr->num_capsets =3D *num_capsets; + return true; } =20 static void virtio_gpu_rutabaga_handle_ctrl(VirtIODevice *vdev, VirtQueue = *vq) @@ -1070,7 +1070,7 @@ static void virtio_gpu_rutabaga_handle_ctrl(VirtIODev= ice *vdev, VirtQueue *vq) =20 static void virtio_gpu_rutabaga_realize(DeviceState *qdev, Error **errp) { - int num_capsets; + uint32_t num_capsets; VirtIOGPUBase *bdev =3D VIRTIO_GPU_BASE(qdev); VirtIOGPU *gpudev =3D VIRTIO_GPU(qdev); =20 @@ -1083,8 +1083,7 @@ static void virtio_gpu_rutabaga_realize(DeviceState *= qdev, Error **errp) return; } =20 - num_capsets =3D virtio_gpu_rutabaga_get_num_capsets(gpudev); - if (!num_capsets) { + if (!virtio_gpu_rutabaga_get_num_capsets(gpudev, &num_capsets, errp)) { return; } =20 --=20 2.52.0