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=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 E6E8DC43381 for ; Mon, 28 Dec 2020 12:56:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE7D822AAA for ; Mon, 28 Dec 2020 12:56:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728807AbgL1M4o (ORCPT ); Mon, 28 Dec 2020 07:56:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:52674 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728775AbgL1M4h (ORCPT ); Mon, 28 Dec 2020 07:56:37 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 665DF208B6; Mon, 28 Dec 2020 12:56:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609160182; bh=hN//SUe8IPgpmWtUUzsfGKLVhQz8xJVBNrm0Inhur+Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H7AUfV57IUBWGNaNBgVxUQxS9KO/fkUGuv0TTDAShAEY66W87xYQIW8LqPjIc3cRK OpTvjkisJ26r5dKqWALrWJTEps9uhDsckd2SF5U09uC80FxQsPrMIXhfRGvnPzwZ0I PGuBKHx9cLRvcjWbSC9W13Fm4T+e1BnAIlUplx2w= 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 4.4 097/132] media: gspca: Fix memory leak in probe Date: Mon, 28 Dec 2020 13:49:41 +0100 Message-Id: <20201228124851.099553745@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124846.409999325@linuxfoundation.org> References: <20201228124846.409999325@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 @@ -2130,6 +2130,7 @@ 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;