From patchwork Tue Jun 9 17:44:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 224594 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,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 E3AB7C433E2 for ; Tue, 9 Jun 2020 18:25:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B9480206C3 for ; Tue, 9 Jun 2020 18:25:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591727124; bh=0l8c9k+8yFocyzIgv8IfzIQTVYUyVs5GizGv3/sGW/A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uSXt6lxbbQpujEBv93fS3r1nixb+/8qIaysU6td6f4h8oU1y1jZhBpJzbnRjx0GBa 9sptEfXWNXvQlB9gFtenN65wCBPshPhpmnq+SnhsYIqHcSJ0t0JNuT7MdMPNtphk5+ k/ceDKTktNPH4LrX44EzE3BD+VOxqZZ7SfysJI/g= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730477AbgFISZX (ORCPT ); Tue, 9 Jun 2020 14:25:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:56748 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729130AbgFIRqe (ORCPT ); Tue, 9 Jun 2020 13:46:34 -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 65CCF2081A; Tue, 9 Jun 2020 17:46:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591724793; bh=0l8c9k+8yFocyzIgv8IfzIQTVYUyVs5GizGv3/sGW/A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iAo/PJIndw9TdZx/YluEk0PezjzWAScc175htn+7lKoqB3XTN9I7gCJflJux/yRDb g/V4Q5qAfZ1oM2fFkskhk35Vq0ZGsbyhAGyXWLADec32k7iarJNlzzR5H5hsis5+U3 uqhTgp2FeaeGtWrf/+QzNKd5A/nfIZkfKe5gQ5Q8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jeremy Kerr , Stan Johnson , Finn Thain , "David S. Miller" , Sasha Levin Subject: [PATCH 4.4 11/36] net: bmac: Fix read of MAC address from ROM Date: Tue, 9 Jun 2020 19:44:11 +0200 Message-Id: <20200609173933.927328978@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200609173933.288044334@linuxfoundation.org> References: <20200609173933.288044334@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jeremy Kerr [ Upstream commit ef01cee2ee1b369c57a936166483d40942bcc3e3 ] In bmac_get_station_address, We're reading two bytes at a time from ROM, but we do that six times, resulting in 12 bytes of read & writes. This means we will write off the end of the six-byte destination buffer. This change fixes the for-loop to only read/write six bytes. Based on a proposed fix from Finn Thain . Signed-off-by: Jeremy Kerr Reported-by: Stan Johnson Tested-by: Stan Johnson Reported-by: Finn Thain Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/apple/bmac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/apple/bmac.c b/drivers/net/ethernet/apple/bmac.c index a65d7a60f116..ffa7e7e6d18d 100644 --- a/drivers/net/ethernet/apple/bmac.c +++ b/drivers/net/ethernet/apple/bmac.c @@ -1187,7 +1187,7 @@ bmac_get_station_address(struct net_device *dev, unsigned char *ea) int i; unsigned short data; - for (i = 0; i < 6; i++) + for (i = 0; i < 3; i++) { reset_and_select_srom(dev); data = read_srom(dev, i + EnetAddressOffset/2, SROMAddressBits);