From patchwork Mon Sep 30 08:14:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= X-Patchwork-Id: 13815573 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 DEDACCF6497 for ; Mon, 30 Sep 2024 08:21:52 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1svBc1-0004Qm-Q3; Mon, 30 Sep 2024 04:18:34 -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 1svBaq-0006QA-GF for qemu-devel@nongnu.org; Mon, 30 Sep 2024 04:17:23 -0400 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 1svBan-0005wS-JT for qemu-devel@nongnu.org; Mon, 30 Sep 2024 04:17:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1727684236; 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=AU2QKvlXkq2m7fuSrNPGbhF842/fYYgn4Hl/0baIda8=; b=iFPsLlQHL2vUjvWGjjOtH1kdFyfSt4oYvs8i7B6gvUKoFuJowZiPKlnB9X8IMywCoi3ctk qhl141gfBsKcFfiHEdu7N5gnwR7CatPtcZ9ghbqE7WhY0nhKxa6Pa3PnTeF1qXnrZuLzyV QEPMAAqdpO++OCxo2iXJ1KXvNiFJSUA= Received: from mx-prod-mc-02.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-619-S7U4KrorMmGYH_kVM6dSzQ-1; Mon, 30 Sep 2024 04:17:13 -0400 X-MC-Unique: S7U4KrorMmGYH_kVM6dSzQ-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (unknown [10.30.177.17]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 760AA1944DE2; Mon, 30 Sep 2024 08:17:10 +0000 (UTC) Received: from localhost (unknown [10.39.208.36]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 0E4C11955DC7; Mon, 30 Sep 2024 08:17:07 +0000 (UTC) From: marcandre.lureau@redhat.com To: qemu-devel@nongnu.org Cc: Hanna Reitz , Christian Schoenebeck , Fam Zheng , Song Gao , =?utf-8?q?Alex_Benn=C3=A9e?= , Pierrick Bouvier , Mahmoud Mandour , qemu-block@nongnu.org, Laurent Vivier , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Vladimir Sementsov-Ogievskiy , Greg Kurz , =?utf-8?q?Eugenio_P=C3=A9rez?= , Gerd Hoffmann , Bin Meng , Fabiano Rosas , Eric Blake , Hyman Huang , Kevin Wolf , Stefano Garzarella , "Michael S. Tsirkin" , Alexandre Iooss , Marcel Apfelbaum , John Snow , Eduardo Habkost , Jesper Devantier , Peter Xu , Stefan Hajnoczi , Klaus Jensen , Keith Busch , Paolo Bonzini , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Yuval Shaia , Bin Meng , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= Subject: [PATCH v3 19/22] RFC: hw/virtio: a potential leak fix Date: Mon, 30 Sep 2024 12:14:54 +0400 Message-ID: <20240930081458.1926382-20-marcandre.lureau@redhat.com> In-Reply-To: <20240930081458.1926382-1-marcandre.lureau@redhat.com> References: <20240930081458.1926382-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 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: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.095, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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 From: Marc-André Lureau vhost_svq_get_buf() may return a VirtQueueElement that should be freed. It's unclear to me if the vhost_svq_get_buf() call should always return NULL. Signed-off-by: Marc-André Lureau Reviewed-by: Eugenio Pérez --- hw/virtio/vhost-shadow-virtqueue.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index 3b2beaea24..37aca8b431 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -414,6 +414,7 @@ static uint16_t vhost_svq_last_desc_of_chain(const VhostShadowVirtqueue *svq, return i; } +G_GNUC_WARN_UNUSED_RESULT static VirtQueueElement *vhost_svq_get_buf(VhostShadowVirtqueue *svq, uint32_t *len) { @@ -528,6 +529,7 @@ size_t vhost_svq_poll(VhostShadowVirtqueue *svq, size_t num) size_t len = 0; while (num--) { + g_autofree VirtQueueElement *elem = NULL; int64_t start_us = g_get_monotonic_time(); uint32_t r = 0; @@ -541,7 +543,7 @@ size_t vhost_svq_poll(VhostShadowVirtqueue *svq, size_t num) } } while (true); - vhost_svq_get_buf(svq, &r); + elem = vhost_svq_get_buf(svq, &r); len += r; }