From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 63F0E6841; Thu, 31 Aug 2017 11:52:24 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B7E7D285B5; Thu, 31 Aug 2017 09:52:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com B7E7D285B5 Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=maxime.coquelin@redhat.com Received: from localhost.localdomain (ovpn-112-32.ams2.redhat.com [10.36.112.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id C7555841C2; Thu, 31 Aug 2017 09:52:16 +0000 (UTC) From: Maxime Coquelin To: dev@dpdk.org, yliu@fridaylinux.org, jfreiman@redhat.com, tiwei.bie@intel.com Cc: mst@redhat.com, vkaplans@redhat.com, jasowang@redhat.com, Maxime Coquelin , stable@dpdk.org Date: Thu, 31 Aug 2017 11:50:17 +0200 Message-Id: <20170831095023.21037-16-maxime.coquelin@redhat.com> In-Reply-To: <20170831095023.21037-1-maxime.coquelin@redhat.com> References: <20170831095023.21037-1-maxime.coquelin@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Thu, 31 Aug 2017 09:52:23 +0000 (UTC) Subject: [dpdk-dev] [PATCH 15/21] vhost: don't dereference invalid dev pointer after its reallocation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Aug 2017 09:52:24 -0000 numa_realloc() reallocates the virtio_net device structure and updates the vhost_devices[] table with the new pointer if the rings are allocated different NUMA node. Problem is that vhost_user_msg_handler() still derenferences old pointer afterward. This patch prevents this by fetching again the dev pointer in vhost_devices[] after messages have been handled. Cc: stable@dpdk.org Fixes: af295ad4698c ("vhost: realloc device and queues to same numa node as vring desc") Signed-off-by: Maxime Coquelin --- lib/librte_vhost/vhost_user.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c index 4f9273fe7..a0c7c2f86 100644 --- a/lib/librte_vhost/vhost_user.c +++ b/lib/librte_vhost/vhost_user.c @@ -1158,6 +1158,12 @@ vhost_user_msg_handler(int vid, int fd) } + /* + * The virtio_net struct might have been reallocated on a different + * NUMA node, so dev pointer might no more be valid. + */ + dev = get_device(vid); + if (msg.flags & VHOST_USER_NEED_REPLY) { msg.payload.u64 = !!ret; msg.size = sizeof(msg.payload.u64); -- 2.13.3