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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A6D5EC7EE43 for ; Wed, 7 Jun 2023 20:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235477AbjFGUze (ORCPT ); Wed, 7 Jun 2023 16:55:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235866AbjFGUzS (ORCPT ); Wed, 7 Jun 2023 16:55:18 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C378992 for ; Wed, 7 Jun 2023 13:55:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 607D0647E4 for ; Wed, 7 Jun 2023 20:55:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74AA2C433D2; Wed, 7 Jun 2023 20:55:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686171316; bh=v1H9KINHYtMXlscOlXvEON4/t0yKwh97LJqgsXOASCM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jiYtnHejwMRDfaylZ4kN9chcURsgveAARz588b2apg5VPAU3G2qm2I+URs2WnUsLO 9f+uqvChY5MVMyxNXnBs5vF6DECDBMUEldzMhEPOiyJopqWQb8TZu0hNq9/K6Cz1ft Us36aQk3yZ9rn2kL3jbjeC/GhACv+FyaEli6koco= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Wei Chen , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 5.4 44/99] media: dvb-usb: dw2102: fix uninit-value in su3000_read_mac_address Date: Wed, 7 Jun 2023 22:16:36 +0200 Message-ID: <20230607200901.632144446@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607200900.195572674@linuxfoundation.org> References: <20230607200900.195572674@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Wei Chen [ Upstream commit a3fd1ef27aa686d871cefe207bd6168c4b0cd29e ] In su3000_read_mac_address, if i2c_transfer fails to execute two messages, array mac address will not be initialized. Without handling such error, later in function dvb_usb_adapter_dvb_init, proposed_mac is accessed before initialization. Fix this error by returning a negative value if message execution fails. Link: https://lore.kernel.org/linux-media/20230328124416.560889-1-harperchen1110@gmail.com Signed-off-by: Wei Chen Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/dvb-usb/dw2102.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c index 8493ebb377c4d..f8f589ebab74b 100644 --- a/drivers/media/usb/dvb-usb/dw2102.c +++ b/drivers/media/usb/dvb-usb/dw2102.c @@ -946,7 +946,7 @@ static int su3000_read_mac_address(struct dvb_usb_device *d, u8 mac[6]) for (i = 0; i < 6; i++) { obuf[1] = 0xf0 + i; if (i2c_transfer(&d->i2c_adap, msg, 2) != 2) - break; + return -1; else mac[i] = ibuf[0]; } -- 2.39.2