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=-13.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 2BF0AC43461 for ; Mon, 7 Sep 2020 16:43:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC5F0207DE for ; Mon, 7 Sep 2020 16:43:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599497020; bh=FLjVWqdzzGbjc6JJXhuMZ4OiQNBkym+OTNYfGvDLGZY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=d2XNUCMNAYUucV2cx47MmSSwgFwq7DTwgW52J1TdcNjacOdGY3pLb2wrjwrFlN2rx IGnnktM2pt/wrSc354K+4O4Zi+9GovMya5qYpjsshC5wEvKLR7rl4wAV+P/CukWjiC VyBmpfAI25TePBpbmFs4e65ORG/hUfJMQKbrhRco= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731007AbgIGQni (ORCPT ); Mon, 7 Sep 2020 12:43:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:49790 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730864AbgIGQfv (ORCPT ); Mon, 7 Sep 2020 12:35:51 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DAD0321D90; Mon, 7 Sep 2020 16:35:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599496550; bh=FLjVWqdzzGbjc6JJXhuMZ4OiQNBkym+OTNYfGvDLGZY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iHxHkRRpx+1AzT38M68ZDbKkPxtUdS3YGRYm7fMZ3tGmXuPhmn7yVwrSjA5eBU2Qe wFV0Q+c6hQgvscFL2lX1ecXRxda7FcG/8WhjBpy/wFB5ioRcW6ZiBzrtQuBPlf4SYP gCVUTR/FwtXKx0WFkm5+obNZrbMktDkomEtbaitk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Himadri Pandya , "David S . Miller" , Sasha Levin , linux-usb@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 05/10] net: usb: Fix uninit-was-stored issue in asix_read_phy_addr() Date: Mon, 7 Sep 2020 12:35:38 -0400 Message-Id: <20200907163543.1281889-5-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200907163543.1281889-1-sashal@kernel.org> References: <20200907163543.1281889-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Himadri Pandya [ Upstream commit a092b7233f0e000cc6f2c71a49e2ecc6f917a5fc ] 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: Sasha Levin --- drivers/net/usb/asix_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c index 2092ef6431f20..712765976a221 100644 --- a/drivers/net/usb/asix_common.c +++ b/drivers/net/usb/asix_common.c @@ -251,7 +251,7 @@ int asix_read_phy_addr(struct usbnet *dev, int internal) 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; } -- 2.25.1