From patchwork Thu May 20 09:20:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445441 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=-19.1 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=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 C5E3DC43617 for ; Thu, 20 May 2021 10:49:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B122F61186 for ; Thu, 20 May 2021 10:49:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237324AbhETKu7 (ORCPT ); Thu, 20 May 2021 06:50:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:46230 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238396AbhETKrk (ORCPT ); Thu, 20 May 2021 06:47:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2B32361CB2; Thu, 20 May 2021 09:58:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621504703; bh=HBPqF4Hd1TRcxCc7qkm5EAA7FWD5tkppknHF7awM84I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P4XwDg8OfwFlTz9Jo149mkI4Cy1UW8Ic+2/8g7hCr+ryMK9hfZVcED+4VzyIrS/wb 0N8ARdu7cxtPV8IACyr6Hka7FIVrKzit1Zv/KjudcZDL0Hzylc6Es7ci1yt4SD9lzu DpH6sh8tDqqDV4JoThOem+Dd/rGLu5evuRjGw8II= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , syzbot+e7f4c64a4248a0340c37@syzkaller.appspotmail.com Subject: [PATCH 4.9 043/240] media: gscpa/stv06xx: fix memory leak Date: Thu, 20 May 2021 11:20:35 +0200 Message-Id: <20210520092110.108648386@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092108.587553970@linuxfoundation.org> References: <20210520092108.587553970@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Hans Verkuil [ Upstream commit 4f4e6644cd876c844cdb3bea2dd7051787d5ae25 ] For two of the supported sensors the stv06xx driver allocates memory which is stored in sd->sensor_priv. This memory is freed on a disconnect, but if the probe() fails, then it isn't freed and so this leaks memory. Add a new probe_error() op that drivers can use to free any allocated memory in case there was a probe failure. Thanks to Pavel Skripkin for discovering the cause of the memory leak. Reported-and-tested-by: syzbot+e7f4c64a4248a0340c37@syzkaller.appspotmail.com Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/gspca/gspca.c | 2 ++ drivers/media/usb/gspca/gspca.h | 1 + drivers/media/usb/gspca/stv06xx/stv06xx.c | 9 +++++++++ 3 files changed, 12 insertions(+) diff --git a/drivers/media/usb/gspca/gspca.c b/drivers/media/usb/gspca/gspca.c index d239075a6a65..79f1e8904e30 100644 --- a/drivers/media/usb/gspca/gspca.c +++ b/drivers/media/usb/gspca/gspca.c @@ -2146,6 +2146,8 @@ out: #endif v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); v4l2_device_unregister(&gspca_dev->v4l2_dev); + if (sd_desc->probe_error) + sd_desc->probe_error(gspca_dev); kfree(gspca_dev->usb_buf); kfree(gspca_dev); return ret; diff --git a/drivers/media/usb/gspca/gspca.h b/drivers/media/usb/gspca/gspca.h index d39adf90303b..bec8fccc2c94 100644 --- a/drivers/media/usb/gspca/gspca.h +++ b/drivers/media/usb/gspca/gspca.h @@ -101,6 +101,7 @@ struct sd_desc { cam_cf_op config; /* called on probe */ cam_op init; /* called on probe and resume */ cam_op init_controls; /* called on probe */ + cam_v_op probe_error; /* called if probe failed, do cleanup here */ cam_op start; /* called on stream on after URBs creation */ cam_pkt_op pkt_scan; /* optional operations */ diff --git a/drivers/media/usb/gspca/stv06xx/stv06xx.c b/drivers/media/usb/gspca/stv06xx/stv06xx.c index 7d255529ed4c..40d4c99debb8 100644 --- a/drivers/media/usb/gspca/stv06xx/stv06xx.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx.c @@ -541,12 +541,21 @@ static int sd_int_pkt_scan(struct gspca_dev *gspca_dev, static int stv06xx_config(struct gspca_dev *gspca_dev, const struct usb_device_id *id); +static void stv06xx_probe_error(struct gspca_dev *gspca_dev) +{ + struct sd *sd = (struct sd *)gspca_dev; + + kfree(sd->sensor_priv); + sd->sensor_priv = NULL; +} + /* sub-driver description */ static const struct sd_desc sd_desc = { .name = MODULE_NAME, .config = stv06xx_config, .init = stv06xx_init, .init_controls = stv06xx_init_controls, + .probe_error = stv06xx_probe_error, .start = stv06xx_start, .stopN = stv06xx_stopN, .pkt_scan = stv06xx_pkt_scan,