From patchwork Mon May 16 19:37:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 573705 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE028C4321E for ; Mon, 16 May 2022 20:13:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244320AbiEPULF (ORCPT ); Mon, 16 May 2022 16:11:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351089AbiEPUB7 (ORCPT ); Mon, 16 May 2022 16:01:59 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7103840912; Mon, 16 May 2022 12:58:42 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 2C671B81616; Mon, 16 May 2022 19:58:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6CAFC385AA; Mon, 16 May 2022 19:58:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652731119; bh=P260iAUL3ZqmnZgfQd8Cg8lNIyUPcm3RRa3bK0X6tVg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2rOToLGPvuMPwJxIaTzg2y/J/Q0Y/n2NOfCKq8uPPMjFIcNSOJUaI9NDZBydGrLxu f0VB/yAdDRpU4zWDfW/3Ni7xMUORT/0N2O0giaPUOWUqVHsgbg92aEB5bBkA8OayWB OYQoVb9pYHn4NVE6Kp29tuiL3kGuo+YDiUZeGwVg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Fabio Estevam , Andrew Lunn , Jakub Kicinski Subject: [PATCH 5.17 106/114] net: phy: micrel: Do not use kszphy_suspend/resume for KSZ8061 Date: Mon, 16 May 2022 21:37:20 +0200 Message-Id: <20220516193628.517664127@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193625.489108457@linuxfoundation.org> References: <20220516193625.489108457@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Fabio Estevam commit e333eed63a091a09bd0db191b7710c594c6e995b upstream. Since commit f1131b9c23fb ("net: phy: micrel: use kszphy_suspend()/kszphy_resume for irq aware devices") the following NULL pointer dereference is observed on a board with KSZ8061: # udhcpc -i eth0 udhcpc: started, v1.35.0 8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000008 pgd = f73cef4e [00000008] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: CPU: 0 PID: 196 Comm: ifconfig Not tainted 5.15.37-dirty #94 Hardware name: Freescale i.MX6 SoloX (Device Tree) PC is at kszphy_config_reset+0x10/0x114 LR is at kszphy_resume+0x24/0x64 ... The KSZ8061 phy_driver structure does not have the .probe/..driver_data fields, which means that priv is not allocated. This causes the NULL pointer dereference inside kszphy_config_reset(). Fix the problem by using the generic suspend/resume functions as before. Another alternative would be to provide the .probe and .driver_data information into the structure, but to be on the safe side, let's just restore Ethernet functionality by using the generic suspend/resume. Cc: stable@vger.kernel.org Fixes: f1131b9c23fb ("net: phy: micrel: use kszphy_suspend()/kszphy_resume for irq aware devices") Signed-off-by: Fabio Estevam Reviewed-by: Andrew Lunn Link: https://lore.kernel.org/r/20220504143104.1286960-1-festevam@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- drivers/net/phy/micrel.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/net/phy/micrel.c +++ b/drivers/net/phy/micrel.c @@ -1850,8 +1850,8 @@ static struct phy_driver ksphy_driver[] .config_init = ksz8061_config_init, .config_intr = kszphy_config_intr, .handle_interrupt = kszphy_handle_interrupt, - .suspend = kszphy_suspend, - .resume = kszphy_resume, + .suspend = genphy_suspend, + .resume = genphy_resume, }, { .phy_id = PHY_ID_KSZ9021, .phy_id_mask = 0x000ffffe,