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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 0D4AEC433F5 for ; Mon, 20 Sep 2021 17:00:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3DA961245 for ; Mon, 20 Sep 2021 17:00:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244734AbhITRBi (ORCPT ); Mon, 20 Sep 2021 13:01:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:47062 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245548AbhITQ6G (ORCPT ); Mon, 20 Sep 2021 12:58:06 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A5975613AB; Mon, 20 Sep 2021 16:51:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632156713; bh=6u6Q4wSBZEdAEKGrPyCj/vcDVN5MmOsabMa/Rb3uEYA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jnNz+IyrZ1Pfyx2xvHMTzKC2uXkFsUURkZhTnGkakNwd+k6RsacpKjdxTQEx+VQO7 hEG1RNOV6ZeHNVfe/ayT650QVyAhfmRl6lElb+I22ZO8fvbxXUFeDGyUTj3dpx3ZDG pke06gdCWa+i0QRYfJWmEsmvGRQtZsVIk1CrXE3I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+e27b4fd589762b0b9329@syzkaller.appspotmail.com, Dongliang Mu , Sean Young , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 4.9 052/175] media: dvb-usb: fix uninit-value in dvb_usb_adapter_dvb_init Date: Mon, 20 Sep 2021 18:41:41 +0200 Message-Id: <20210920163919.760797645@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163918.068823680@linuxfoundation.org> References: <20210920163918.068823680@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: Dongliang Mu [ Upstream commit c5453769f77ce19a5b03f1f49946fd3f8a374009 ] If dibusb_read_eeprom_byte fails, the mac address is not initialized. And nova_t_read_mac_address does not handle this failure, which leads to the uninit-value in dvb_usb_adapter_dvb_init. Fix this by handling the failure of dibusb_read_eeprom_byte. Reported-by: syzbot+e27b4fd589762b0b9329@syzkaller.appspotmail.com Fixes: 786baecfe78f ("[media] dvb-usb: move it to drivers/media/usb/dvb-usb") Signed-off-by: Dongliang Mu Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/dvb-usb/nova-t-usb2.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/dvb-usb/nova-t-usb2.c b/drivers/media/usb/dvb-usb/nova-t-usb2.c index 1babd3341910..016a6d1ad279 100644 --- a/drivers/media/usb/dvb-usb/nova-t-usb2.c +++ b/drivers/media/usb/dvb-usb/nova-t-usb2.c @@ -133,7 +133,7 @@ ret: static int nova_t_read_mac_address (struct dvb_usb_device *d, u8 mac[6]) { - int i; + int i, ret; u8 b; mac[0] = 0x00; @@ -142,7 +142,9 @@ static int nova_t_read_mac_address (struct dvb_usb_device *d, u8 mac[6]) /* this is a complete guess, but works for my box */ for (i = 136; i < 139; i++) { - dibusb_read_eeprom_byte(d,i, &b); + ret = dibusb_read_eeprom_byte(d, i, &b); + if (ret) + return ret; mac[5 - (i - 136)] = b; } -- 2.30.2