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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, 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 67F1DC433E0 for ; Mon, 28 Dec 2020 15:59:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A7D7207CF for ; Mon, 28 Dec 2020 15:59:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393364AbgL1P7D (ORCPT ); Mon, 28 Dec 2020 10:59:03 -0500 Received: from mail.kernel.org ([198.145.29.99]:33748 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387907AbgL1Nd0 (ORCPT ); Mon, 28 Dec 2020 08:33:26 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4990B208BA; Mon, 28 Dec 2020 13:33:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609162390; bh=3wSvMfr6rAe3rr5bfNq49T8RsR1hMLZUWvLvwV6wReY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C8cEZWpUdlpLXtjTWqCfV1FYiXmAiKeELGy9pW/PjpPfcgpePeRDbfLgB9PfWad1x 879DIzDSnP4wohUFVykzYKkKWPUyEWrj7cNXwF+sFr2pbfWZ378BbZIKPwSO9Xgd5E Wv7y63YYtmV2fYjEWeq1Rv/MrW6LpCiUE2Nk6Je8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alan Stern , Hans Verkuil , Mauro Carvalho Chehab , syzbot+44e64397bd81d5e84cba@syzkaller.appspotmail.com Subject: [PATCH 4.19 258/346] media: gspca: Fix memory leak in probe Date: Mon, 28 Dec 2020 13:49:37 +0100 Message-Id: <20201228124932.252331748@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124919.745526410@linuxfoundation.org> References: <20201228124919.745526410@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: Alan Stern commit e469d0b09a19496e1972a20974bbf55b728151eb upstream. The gspca driver leaks memory when a probe fails. gspca_dev_probe2() calls v4l2_device_register(), which takes a reference to the underlying device node (in this case, a USB interface). But the failure pathway neglects to call v4l2_device_unregister(), the routine responsible for dropping this reference. Consequently the memory for the USB interface and its device never gets released. This patch adds the missing function call. Reported-and-tested-by: syzbot+44e64397bd81d5e84cba@syzkaller.appspotmail.com Signed-off-by: Alan Stern CC: Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/gspca/gspca.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/media/usb/gspca/gspca.c +++ b/drivers/media/usb/gspca/gspca.c @@ -1585,6 +1585,7 @@ out: input_unregister_device(gspca_dev->input_dev); #endif v4l2_ctrl_handler_free(gspca_dev->vdev.ctrl_handler); + v4l2_device_unregister(&gspca_dev->v4l2_dev); kfree(gspca_dev->usb_buf); kfree(gspca_dev); return ret;