From patchwork Tue Jun 8 15:26:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Simon Wunderlich X-Patchwork-Id: 456403 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A6ACC47082 for ; Tue, 8 Jun 2021 15:35:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 79F256136D for ; Tue, 8 Jun 2021 15:35:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233017AbhFHPhY (ORCPT ); Tue, 8 Jun 2021 11:37:24 -0400 Received: from simonwunderlich.de ([79.140.42.25]:34610 "EHLO simonwunderlich.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231401AbhFHPhX (ORCPT ); Tue, 8 Jun 2021 11:37:23 -0400 X-Greylist: delayed 506 seconds by postgrey-1.27 at vger.kernel.org; Tue, 08 Jun 2021 11:37:22 EDT Received: from kero.packetmixer.de (p200300c5970dd3e020a52263b5aabfb3.dip0.t-ipconnect.de [IPv6:2003:c5:970d:d3e0:20a5:2263:b5aa:bfb3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by simonwunderlich.de (Postfix) with ESMTPSA id 8DB35174026; Tue, 8 Jun 2021 17:27:03 +0200 (CEST) From: Simon Wunderlich To: kuba@kernel.org, davem@davemloft.net Cc: netdev@vger.kernel.org, b.a.t.m.a.n@lists.open-mesh.org, =?utf-8?q?Lin?= =?utf-8?q?us_L=C3=BCssing?= , Sven Eckelmann , Simon Wunderlich Subject: [PATCH 04/11] batman-adv: bcast: avoid skb-copy for (re)queued broadcasts Date: Tue, 8 Jun 2021 17:26:53 +0200 Message-Id: <20210608152700.30315-5-sw@simonwunderlich.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210608152700.30315-1-sw@simonwunderlich.de> References: <20210608152700.30315-1-sw@simonwunderlich.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Linus Lüssing Broadcast packets send via batadv_send_outstanding_bcast_packet() were originally copied in batadv_forw_bcast_packet_to_list() before being queued. And after that only the ethernet header will be pushed through batadv_send_broadcast_skb()->batadv_send_skb_packet() which works safely on skb clones as it uses batadv_skb_head_push()->skb_cow_head(). Signed-off-by: Linus Lüssing Signed-off-by: Sven Eckelmann Signed-off-by: Simon Wunderlich --- net/batman-adv/send.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c index 07b0ba265472..0b9dd29d3b6a 100644 --- a/net/batman-adv/send.c +++ b/net/batman-adv/send.c @@ -1072,7 +1072,7 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work) } /* send a copy of the saved skb */ - skb1 = skb_copy(forw_packet->skb, GFP_ATOMIC); + skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); if (!skb1) goto out;