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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 8A488C433E2 for ; Tue, 8 Sep 2020 18:15:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3EB3E2078B for ; Tue, 8 Sep 2020 18:15:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599588908; bh=FpBhz4Ddb/gh95CyeiOQkP7VcFwztOakNoXCsQt3mQw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VU0nPp3d5uKYRsid4fVGwNSY7j6zUahJA5ETIYqBdaKJlx6tFT4EWh6pEEtqOAWyE Y17bW8kA7m/+0YNiTPZt4Og7VyEx4Pkdbz8WVdHn5EQ647+UlkCDogHjp0vcnlovNV A0K458fNiKrdLQqwjdr1Xc6nt7VgqhHZnViBX6QM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731315AbgIHSPF (ORCPT ); Tue, 8 Sep 2020 14:15:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:56678 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731479AbgIHQLn (ORCPT ); Tue, 8 Sep 2020 12:11:43 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 B096924761; Tue, 8 Sep 2020 15:41:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599579700; bh=FpBhz4Ddb/gh95CyeiOQkP7VcFwztOakNoXCsQt3mQw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CDvle6eT23LKcbSoDq+1q/WfaD4VAZ8uWX+ptWJwOWfdYiLHCQuJBD7Y2lMy/7fxn W72xyJsD3HloGE9uj7NxcS7pIst7Ykq8ueQBNO2bwsn5O4FTlApB7yEqU0jCWDYoep i+LX6OA2KMsSHGuydZxun6u+8QGPS90mI129DlLo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Himadri Pandya , "David S. Miller" Subject: [PATCH 5.8 186/186] net: usb: Fix uninit-was-stored issue in asix_read_phy_addr() Date: Tue, 8 Sep 2020 17:25:28 +0200 Message-Id: <20200908152250.686229315@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200908152241.646390211@linuxfoundation.org> References: <20200908152241.646390211@linuxfoundation.org> User-Agent: quilt/0.66 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 From: Himadri Pandya commit a092b7233f0e000cc6f2c71a49e2ecc6f917a5fc upstream. The buffer size is 2 Bytes and we expect to receive the same amount of data. But sometimes we receive less data and run into uninit-was-stored issue upon read. Hence modify the error check on the return value to match with the buffer size as a prevention. Reported-and-tested by: syzbot+a7e220df5a81d1ab400e@syzkaller.appspotmail.com Signed-off-by: Himadri Pandya Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/usb/asix_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/usb/asix_common.c +++ b/drivers/net/usb/asix_common.c @@ -296,7 +296,7 @@ int asix_read_phy_addr(struct usbnet *de netdev_dbg(dev->net, "asix_get_phy_addr()\n"); - if (ret < 0) { + if (ret < 2) { netdev_err(dev->net, "Error reading PHYID register: %02x\n", ret); goto out; }