Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752561AbdLAFzB (ORCPT ); Fri, 1 Dec 2017 00:55:01 -0500 Received: from mx1.redhat.com ([209.132.183.28]:40186 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751989AbdLAFyn (ORCPT ); Fri, 1 Dec 2017 00:54:43 -0500 From: wexu@redhat.com To: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: jasowang@redhat.com, mst@redhat.com, mjrosato@linux.vnet.ibm.com, wexu@redhat.com Subject: [PATCH 3/3] tap: free skb if flags error Date: Fri, 1 Dec 2017 00:54:29 -0500 Message-Id: <1512107669-27572-4-git-send-email-wexu@redhat.com> In-Reply-To: <1512107669-27572-1-git-send-email-wexu@redhat.com> References: <1512107669-27572-1-git-send-email-wexu@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Fri, 01 Dec 2017 05:54:43 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1062 Lines: 34 From: Wei Xu tap_recvmsg() supports accepting skb by msg_control after commit 3b4ba04acca8 ("tap: support receiving skb from msg_control"), the skb if presented should be freed within the function, otherwise it would be leaked. Signed-off-by: Wei Xu Reported-by: Matthew Rosato --- drivers/net/tap.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/tap.c b/drivers/net/tap.c index e9489b8..1c66b75 100644 --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -1154,9 +1154,13 @@ static int tap_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, int flags) { struct tap_queue *q = container_of(sock, struct tap_queue, sock); + struct sk_buff *skb = m->msg_control; int ret; - if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) + if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) { + if (skb) + kfree_skb(skb); return -EINVAL; + } ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT, m->msg_control); if (ret > total_len) { -- 1.8.3.1