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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 959F2C47247 for ; Fri, 8 May 2020 12:46:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6CF992495A for ; Fri, 8 May 2020 12:46:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588942004; bh=zQEITwS3Tb1sOo6M0wkESRrjv9nok4D8igd06GWXhRo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=0QwdUzJAw/h4we4HVMyv3hHmbdEmUYIZZg5Q8kK9hP8p2qkTh/Xiv9BpvO1xcOWFV SqXAJWOU9Gy4HYJ9Pr/z8/DoBX7iKdUTyE8s7uHJqHPJt7wbModvkXdtyDcq6UOI3W gqmFI1qg4RySpNH2qoUnD8ciJtwaGjsTxGD0Qqa0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729462AbgEHMqn (ORCPT ); Fri, 8 May 2020 08:46:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:48274 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729458AbgEHMql (ORCPT ); Fri, 8 May 2020 08:46:41 -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 888D52145D; Fri, 8 May 2020 12:46:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588942001; bh=zQEITwS3Tb1sOo6M0wkESRrjv9nok4D8igd06GWXhRo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jUj14SyP8W7Cg1Pb8vCW215/y/iuJerW8nP1B/V1rqv16pwj6kWCvrTxOEN5xYGjb auDIcUAAmwS29ed7cFcbzQkJXsfRWdgue2V4tBKxL6xwuTfg6lcVoQlktebH6rgQDk 474SLE6uagsCmkBR9fymES2MCfuFzm/w/CtuIj90= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Edward Cree , "David S. Miller" Subject: [PATCH 4.4 257/312] sfc: fix potential stack corruption from running past stat bitmask Date: Fri, 8 May 2020 14:34:08 +0200 Message-Id: <20200508123142.471062638@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200508123124.574959822@linuxfoundation.org> References: <20200508123124.574959822@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Andrew Rybchenko commit e70c70c38d7a5ced76fc8b1c4a7ccee76e9c2911 upstream. On 32-bit systems, mask is only an array of 3 longs, not 4, so don't try to write to mask[3]. Also include build-time checks in case the size of the bitmask changes. Fixes: 3c36a2aded8c ("sfc: display vadaptor statistics for all interfaces") Signed-off-by: Edward Cree Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/sfc/ef10.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/net/ethernet/sfc/ef10.c +++ b/drivers/net/ethernet/sfc/ef10.c @@ -1304,13 +1304,14 @@ static void efx_ef10_get_stat_mask(struc } #if BITS_PER_LONG == 64 + BUILD_BUG_ON(BITS_TO_LONGS(EF10_STAT_COUNT) != 2); mask[0] = raw_mask[0]; mask[1] = raw_mask[1]; #else + BUILD_BUG_ON(BITS_TO_LONGS(EF10_STAT_COUNT) != 3); mask[0] = raw_mask[0] & 0xffffffff; mask[1] = raw_mask[0] >> 32; mask[2] = raw_mask[1] & 0xffffffff; - mask[3] = raw_mask[1] >> 32; #endif }