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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 5A0B5C433DF for ; Thu, 20 Aug 2020 10:06:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B22B20738 for ; Thu, 20 Aug 2020 10:06:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917993; bh=VsjZbyDoFnSpuIJdUWlBT69iwFkVIb5It172DSCdcZ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Am841VEVzSQra+YLrKthICKVHD6Zb4uooCAxgTc50Q0IKrCdzw02g8mGlbN6AgJxH DPnHek3IJEhGIKpbNWwtap/TLcUCp8ci3yyX+PJi5uaQx6Fpm34DRn4pU77nPZ32dp 6rRadpntgahoj8GPzVfzP533cQS5rDACMhkRjK4s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729623AbgHTKGa (ORCPT ); Thu, 20 Aug 2020 06:06:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:50532 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729289AbgHTKB0 (ORCPT ); Thu, 20 Aug 2020 06:01:26 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 B59EE208E4; Thu, 20 Aug 2020 10:01:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917686; bh=VsjZbyDoFnSpuIJdUWlBT69iwFkVIb5It172DSCdcZ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=syVf5nLgn2bY0eWfWT3qoQloKgjBPPVfeJ+TQAPpbfWl7evqzPUbk1yreXOf9cnaK Ha1I4U4V2Cfe67dQFMIty3WNauRe3yt/gz10O1xkanEG7nEOTJrS19RLaQ9zsUMTGO BLW5Mu7YtBsY798UnCTTPi1aU3w1uSOskXdr1TZ0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 4.9 120/212] media: firewire: Using uninitialized values in node_probe() Date: Thu, 20 Aug 2020 11:21:33 +0200 Message-Id: <20200820091608.415807729@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@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: Dan Carpenter [ Upstream commit 2505a210fc126599013aec2be741df20aaacc490 ] If fw_csr_string() returns -ENOENT, then "name" is uninitialized. So then the "strlen(model_names[i]) <= name_len" is true because strlen() is unsigned and -ENOENT is type promoted to a very high positive value. Then the "strncmp(name, model_names[i], name_len)" uses uninitialized data because "name" is uninitialized. Fixes: 92374e886c75 ("[media] firedtv: drop obsolete backend abstraction") Signed-off-by: Dan Carpenter Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/firewire/firedtv-fw.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/firewire/firedtv-fw.c b/drivers/media/firewire/firedtv-fw.c index 247f0e7cb5f7f..5d634706a7eaa 100644 --- a/drivers/media/firewire/firedtv-fw.c +++ b/drivers/media/firewire/firedtv-fw.c @@ -271,6 +271,8 @@ static int node_probe(struct fw_unit *unit, const struct ieee1394_device_id *id) name_len = fw_csr_string(unit->directory, CSR_MODEL, name, sizeof(name)); + if (name_len < 0) + return name_len; for (i = ARRAY_SIZE(model_names); --i; ) if (strlen(model_names[i]) <= name_len && strncmp(name, model_names[i], name_len) == 0) -- 2.25.1