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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 9A47AC43331 for ; Mon, 11 Nov 2019 18:34:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 689092173B for ; Mon, 11 Nov 2019 18:34:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573497289; bh=Jlv9ukXX2oMCUigdyLnVYSC/Qt/S2pddvMuA9duPMcs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ZQubpOz2vQYOROi5vEDUQAgjTOgWxd39jORLoEqiU/qn/YAscJ7MyzVGO/gVDcEEk +sOy3mV7gtGRWHNG5XPeXBVehg4iLv9OpxdKThcnw8OAukOCkT81oNPA+OIDavEGx6 5cbFwih3cgR1myK59izeUy2WmQ6hCDSwQO3SYOvo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727738AbfKKSes (ORCPT ); Mon, 11 Nov 2019 13:34:48 -0500 Received: from mail.kernel.org ([198.145.29.99]:52450 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727498AbfKKSeo (ORCPT ); Mon, 11 Nov 2019 13:34:44 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.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 96DED2173B; Mon, 11 Nov 2019 18:34:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573497284; bh=Jlv9ukXX2oMCUigdyLnVYSC/Qt/S2pddvMuA9duPMcs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=uFz8EJvRBqHifok2T4X5uWnloqI8tPPKetdkJUNaiNQ5j6C/mhQAjfLJtuOrWRkgB PdlrJ4rdn+mvJNlabRscJ8hcrQe9xqNHZH21Gs/x05Amm46NRHZ365lZZtHnF2ZoCy J16m7o/Bk8oXeMuF4O6FrS0OdJBmTWKRVjq3NmYE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dakshaja Uppalapati , Potnuri Bharat Teja , Jason Gunthorpe , Sasha Levin Subject: [PATCH 4.9 52/65] RDMA/iw_cxgb4: Avoid freeing skb twice in arp failure case Date: Mon, 11 Nov 2019 19:28:52 +0100 Message-Id: <20191111181351.621458821@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191111181331.917659011@linuxfoundation.org> References: <20191111181331.917659011@linuxfoundation.org> User-Agent: quilt/0.66 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 From: Potnuri Bharat Teja [ Upstream commit d4934f45693651ea15357dd6c7c36be28b6da884 ] _put_ep_safe() and _put_pass_ep_safe() free the skb before it is freed by process_work(). fix double free by freeing the skb only in process_work(). Fixes: 1dad0ebeea1c ("iw_cxgb4: Avoid touch after free error in ARP failure handlers") Link: https://lore.kernel.org/r/1572006880-5800-1-git-send-email-bharat@chelsio.com Signed-off-by: Dakshaja Uppalapati Signed-off-by: Potnuri Bharat Teja Reviewed-by: Jason Gunthorpe Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/hw/cxgb4/cm.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c index e5752352e0fb1..605d50ad123cc 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -490,7 +490,6 @@ static int _put_ep_safe(struct c4iw_dev *dev, struct sk_buff *skb) ep = *((struct c4iw_ep **)(skb->cb + 2 * sizeof(void *))); release_ep_resources(ep); - kfree_skb(skb); return 0; } @@ -501,7 +500,6 @@ static int _put_pass_ep_safe(struct c4iw_dev *dev, struct sk_buff *skb) ep = *((struct c4iw_ep **)(skb->cb + 2 * sizeof(void *))); c4iw_put_ep(&ep->parent_ep->com); release_ep_resources(ep); - kfree_skb(skb); return 0; } -- 2.20.1