From patchwork Tue Mar 14 08:39:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13173915 X-Patchwork-Delegate: kuba@kernel.org 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ABE73C6FD1F for ; Tue, 14 Mar 2023 08:40:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230252AbjCNIkF (ORCPT ); Tue, 14 Mar 2023 04:40:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230499AbjCNIjx (ORCPT ); Tue, 14 Mar 2023 04:39:53 -0400 Received: from out30-101.freemail.mail.aliyun.com (out30-101.freemail.mail.aliyun.com [115.124.30.101]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9E8F5CC0E; Tue, 14 Mar 2023 01:39:08 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R591e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046051;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0VdraCBA_1678783143; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VdraCBA_1678783143) by smtp.aliyun-inc.com; Tue, 14 Mar 2023 16:39:04 +0800 From: Xuan Zhuo To: netdev@vger.kernel.org Cc: "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Xuan Zhuo , Heng Qi , virtualization@lists.linux-foundation.org, bpf@vger.kernel.org Subject: [PATCH net 2/2] virtio_net: free xdp shinfo frags when build_skb_from_xdp_buff() fails Date: Tue, 14 Mar 2023 16:39:01 +0800 Message-Id: <20230314083901.40521-3-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20230314083901.40521-1-xuanzhuo@linux.alibaba.com> References: <20230314083901.40521-1-xuanzhuo@linux.alibaba.com> MIME-Version: 1.0 X-Git-Hash: 007492630ac1 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org build_skb_from_xdp_buff() may return NULL, on this scene we need to free the frags of xdp shinfo. Fixes: fab89bafa95b ("virtio-net: support multi-buffer xdp") Signed-off-by: Xuan Zhuo Acked-by: Michael S. Tsirkin Acked-by: John Fastabend --- drivers/net/virtio_net.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 8ecf7a341d54..d36183be0481 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -1273,9 +1273,12 @@ static struct sk_buff *receive_mergeable(struct net_device *dev, switch (act) { case XDP_PASS: + head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz); + if (!head_skb) + goto err_xdp_frags; + if (unlikely(xdp_page != page)) put_page(page); - head_skb = build_skb_from_xdp_buff(dev, vi, &xdp, xdp_frags_truesz); rcu_read_unlock(); return head_skb; case XDP_TX: