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=-7.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 54720C43441 for ; Thu, 29 Nov 2018 14:17:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1C1E7208E7 for ; Thu, 29 Nov 2018 14:17:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Noc7x51F" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1C1E7208E7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730300AbeK3BWk (ORCPT ); Thu, 29 Nov 2018 20:22:40 -0500 Received: from mail.kernel.org ([198.145.29.99]:44444 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729335AbeK3BWj (ORCPT ); Thu, 29 Nov 2018 20:22:39 -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 DC6BC208E7; Thu, 29 Nov 2018 14:17:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1543501029; bh=KZGzmwVwYOHoxghKlDjuacAKGo1dlSItKDeHYy7AipA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Noc7x51FAsEgVMN7T1esmysI+NTARasRA9wzb7oTlAdDoeZZIAk1t6HKGv1mzOxHj 93FBPJC371ufLBMSH1pANmiNOAmcmFJdD7nMvU6IzqIJAu+EcJhzpy9jWPtruoxxXJ YBn0r3QFXVDkcJS6jOowU3hE5FKnZvMWW3ppWWxE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marc Kleine-Budde Subject: [PATCH 4.4 14/86] can: dev: __can_get_echo_skb(): Dont crash the kernel if can_priv::echo_skb is accessed out of bounds Date: Thu, 29 Nov 2018 15:11:39 +0100 Message-Id: <20181129140111.054108665@linuxfoundation.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181129140109.832117862@linuxfoundation.org> References: <20181129140109.832117862@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review 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 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marc Kleine-Budde commit e7a6994d043a1e31d5b17706a22ce33d2a3e4cdc upstream. If the "struct can_priv::echo_skb" is accessed out of bounds would lead to a kernel crash. Better print a sensible warning message instead and try to recover. Cc: linux-stable Signed-off-by: Marc Kleine-Budde Signed-off-by: Greg Kroah-Hartman --- drivers/net/can/dev.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/net/can/dev.c +++ b/drivers/net/can/dev.c @@ -427,7 +427,11 @@ struct sk_buff *__can_get_echo_skb(struc { struct can_priv *priv = netdev_priv(dev); - BUG_ON(idx >= priv->echo_skb_max); + if (idx >= priv->echo_skb_max) { + netdev_err(dev, "%s: BUG! Trying to access can_priv::echo_skb out of bounds (%u/max %u)\n", + __func__, idx, priv->echo_skb_max); + return NULL; + } if (priv->echo_skb[idx]) { /* Using "struct canfd_frame::len" for the frame