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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=unavailable 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 AAB1BC28EBD for ; Sun, 9 Jun 2019 17:01:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7A2BD206DF for ; Sun, 9 Jun 2019 17:01:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099700; bh=PH8GAvkw+iJdAsXGp8BOIiBkfy7m1it3hmLcSuLdv/Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DLK1+QP9O1wUZCT7LFIWZuSp4VLmEtxmLXvEHW8TMcxeRg1TqOKEHttAM1pb/wYwD zZhpDTLFn9jtmX+7r1PRwTFT9zaN2zP/H8m/dVW7rkhgC80sMicx6ljVDo3JrkK7np JswosAiHQWtR/KK//z41/KQlNjdEVt4bZcOUvlNY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387624AbfFIRBj (ORCPT ); Sun, 9 Jun 2019 13:01:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:38986 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388099AbfFIRBg (ORCPT ); Sun, 9 Jun 2019 13:01:36 -0400 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 ECFBE206DF; Sun, 9 Jun 2019 17:01:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560099696; bh=PH8GAvkw+iJdAsXGp8BOIiBkfy7m1it3hmLcSuLdv/Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rgza+wsEmxbG4myMWz21aWWEAY+axMvl79P7FUm54pOKJfTMJ4ajpjXu7feZBsus3 egyCMIs2Lrf6G79Z3+0P/g9blKcjCnopdQx5Ei8BXuaHOzqLl6PzKfbn3F7y2xnifx owy7PTncp+8cUcq8XNLnxLLohmASuXKZJVBJCeBg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Potnuri Bharat Teja , Jason Gunthorpe , Sasha Levin Subject: [PATCH 4.4 131/241] RDMA/cxgb4: Fix null pointer dereference on alloc_skb failure Date: Sun, 9 Jun 2019 18:41:13 +0200 Message-Id: <20190609164151.577557026@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190609164147.729157653@linuxfoundation.org> References: <20190609164147.729157653@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 [ Upstream commit a6d2a5a92e67d151c98886babdc86d530d27111c ] Currently if alloc_skb fails to allocate the skb a null skb is passed to t4_set_arp_err_handler and this ends up dereferencing the null skb. Avoid the NULL pointer dereference by checking for a NULL skb and returning early. Addresses-Coverity: ("Dereference null return") Fixes: b38a0ad8ec11 ("RDMA/cxgb4: Set arp error handler for PASS_ACCEPT_RPL messages") Signed-off-by: Colin Ian King Acked-by: Potnuri Bharat Teja Signed-off-by: Jason Gunthorpe Signed-off-by: Sasha Levin --- drivers/infiniband/hw/cxgb4/cm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c index c9cffced00ca1..54fd4d81a3f1f 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -360,6 +360,8 @@ static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp) skb_reset_transport_header(skb); } else { skb = alloc_skb(len, gfp); + if (!skb) + return NULL; } t4_set_arp_err_handler(skb, NULL, NULL); return skb; -- 2.20.1