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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1803C433EF for ; Mon, 4 Oct 2021 13:22:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CBABC61153 for ; Mon, 4 Oct 2021 13:22:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236545AbhJDNYn (ORCPT ); Mon, 4 Oct 2021 09:24:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:36474 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233633AbhJDNW7 (ORCPT ); Mon, 4 Oct 2021 09:22:59 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DBF0961BE5; Mon, 4 Oct 2021 13:09:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1633352991; bh=S3/Zscalem1xtomgSCUoNIt9S7Nk1mHUYGSNkhKK1aU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mp2+C24uVkJVRv5fHstvn2A6gdRpsXAeKKANbCiTNrZNv4UkjusTvX2w49necLg5V 0AC0i16VEqqZu8PyiCrucDwad3N9FYraH1315NWu4qU9bwAcll2DxSJp4xKE4W2Oet jylMYVYJ/LQwMOIl6XIhsQ5DV3puOo9EDIGy4qN0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Felicitas Hetzelt , Jacob Keller , Tony Nguyen , Sasha Levin Subject: [PATCH 5.10 46/93] e100: fix length calculation in e100_get_regs_len Date: Mon, 4 Oct 2021 14:52:44 +0200 Message-Id: <20211004125036.078638991@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211004125034.579439135@linuxfoundation.org> References: <20211004125034.579439135@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jacob Keller [ Upstream commit 4329c8dc110b25d5f04ed20c6821bb60deff279f ] commit abf9b902059f ("e100: cleanup unneeded math") tried to simplify e100_get_regs_len and remove a double 'divide and then multiply' calculation that the e100_reg_regs_len function did. This change broke the size calculation entirely as it failed to account for the fact that the numbered registers are actually 4 bytes wide and not 1 byte. This resulted in a significant under allocation of the register buffer used by e100_get_regs. Fix this by properly multiplying the register count by u32 first before adding the size of the dump buffer. Fixes: abf9b902059f ("e100: cleanup unneeded math") Reported-by: Felicitas Hetzelt Signed-off-by: Jacob Keller Signed-off-by: Tony Nguyen Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/e100.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/e100.c b/drivers/net/ethernet/intel/e100.c index 609e47b8287d..fee329d98621 100644 --- a/drivers/net/ethernet/intel/e100.c +++ b/drivers/net/ethernet/intel/e100.c @@ -2435,7 +2435,11 @@ static void e100_get_drvinfo(struct net_device *netdev, static int e100_get_regs_len(struct net_device *netdev) { struct nic *nic = netdev_priv(netdev); - return 1 + E100_PHY_REGS + sizeof(nic->mem->dump_buf); + + /* We know the number of registers, and the size of the dump buffer. + * Calculate the total size in bytes. + */ + return (1 + E100_PHY_REGS) * sizeof(u32) + sizeof(nic->mem->dump_buf); } static void e100_get_regs(struct net_device *netdev, -- 2.33.0