From mboxrd@z Thu Jan 1 00:00:00 1970 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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,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 4BE59C43381 for ; Mon, 18 Feb 2019 13:59:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1D733217D9 for ; Mon, 18 Feb 2019 13:59:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498390; bh=KnlB6fXS18sErm5wdb046CK/z9LrfWhvylX+1O2emaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ApKvSlNF69YWs/YBTW1pRByLoms8qcD8YJnLvz3BTm4qwQtbn8ZR18HLurB0Z3Stq wRPGRO78MTLkybgZC0w62M58mrzGqmndul3ldoyPM77WgcteGN4W69sM1zSnN9y4g8 4r2VXiZmFwPi1y44VDfbfykY1a2YkjaVOOANfyrU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388652AbfBRN7s (ORCPT ); Mon, 18 Feb 2019 08:59:48 -0500 Received: from mail.kernel.org ([198.145.29.99]:40726 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388636AbfBRN7q (ORCPT ); Mon, 18 Feb 2019 08:59:46 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E865520842; Mon, 18 Feb 2019 13:59:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1550498385; bh=KnlB6fXS18sErm5wdb046CK/z9LrfWhvylX+1O2emaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OTG7cowCKtkYowl9UZrNxsKybc2BQx/F0lEsdL8Otj5grhc5SsmBKAJ9/2agnqWdR uZyajdW4znvBGf+ucWQsJ6iAYAOcnVI3LRIKIz31Mvn/JxXE7m+NXh4p4enlk4WL3G MA/YsOGmNM0KMgFWQ2QHW30WATnsA+bSxp3EDbfs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, James Hughes , Eric Dumazet , Woojung Huh , "David S. Miller" , Linus Walleij Subject: [PATCH 4.9 52/58] smsc95xx: Use skb_cow_head to deal with cloned skbs Date: Mon, 18 Feb 2019 14:44:13 +0100 Message-Id: <20190218133512.479473907@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190218133508.567416115@linuxfoundation.org> References: <20190218133508.567416115@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: James Hughes commit e9156cd26a495a18706e796f02a81fee41ec14f4 upstream. The driver was failing to check that the SKB wasn't cloned before adding checksum data. Replace existing handling to extend/copy the header buffer with skb_cow_head. Signed-off-by: James Hughes Acked-by: Eric Dumazet Acked-by: Woojung Huh Signed-off-by: David S. Miller Signed-off-by: Linus Walleij Signed-off-by: Greg Kroah-Hartman --- drivers/net/usb/smsc95xx.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -2011,13 +2011,13 @@ static struct sk_buff *smsc95xx_tx_fixup /* We do not advertise SG, so skbs should be already linearized */ BUG_ON(skb_shinfo(skb)->nr_frags); - if (skb_headroom(skb) < overhead) { - struct sk_buff *skb2 = skb_copy_expand(skb, - overhead, 0, flags); + /* Make writable and expand header space by overhead if required */ + if (skb_cow_head(skb, overhead)) { + /* Must deallocate here as returning NULL to indicate error + * means the skb won't be deallocated in the caller. + */ dev_kfree_skb_any(skb); - skb = skb2; - if (!skb) - return NULL; + return NULL; } if (csum) {