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 6E98FC433E2 for ; Mon, 7 Sep 2020 17:10:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 351D621532 for ; Mon, 7 Sep 2020 17:10:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599498643; bh=9pBF9ZbIvJKK5XQjnCwUnMHDSkOr58cnXFyuulM/huQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=u7iZkktLnZH0bwVRSu4hfDM1FOV6DMpveFF6oapHxyKXK099T5bH4LDzEY1iu/klb 4rKQLwnK4p+bgyXwSIUolyMNOiRkkMNm5uYvN0kCzanl3txS8ToE0BWvT6jKNjD7+k fnnuzopvQb1t4QB73O4K3jsX0fJtWr9+FzeSPe24= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730995AbgIGRHm (ORCPT ); Mon, 7 Sep 2020 13:07:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:46624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730456AbgIGQcv (ORCPT ); Mon, 7 Sep 2020 12:32:51 -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 E207B20757; Mon, 7 Sep 2020 16:32:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599496369; bh=9pBF9ZbIvJKK5XQjnCwUnMHDSkOr58cnXFyuulM/huQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d2H8Pahy41tJQV6x2sCQRjbpgrnlK8joNBKLXt3gIS78WVPlx+hVAAbpHYpmFFwKr u21Dpz4k7KmelxxHltqnCYRzMcS/N8rN1pXekcAKjLI0x8Dg5a9ACE8JhXFfV9EBwB CLwQJWD9QCKOqLNstDKzPtbSy8eSqNLv7QngsUWs= 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 5.8 22/53] net: usb: Fix uninit-was-stored issue in asix_read_phy_addr() Date: Mon, 7 Sep 2020 12:31:48 -0400 Message-Id: <20200907163220.1280412-22-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200907163220.1280412-1-sashal@kernel.org> References: <20200907163220.1280412-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 [ 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 e39f41efda3ec..7bc6e8f856fe0 100644 --- 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 *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