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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 75C83C43457 for ; Fri, 16 Oct 2020 09:07:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D93B214DB for ; Fri, 16 Oct 2020 09:07:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602839247; bh=UmtclSfZhXzimd9NuXcKtwuugePYD7UcrFRljjiXOE8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=aAuI+jlD0+RxVsJgP9oVD3SPjyCA+bO8aVK2zGX9oUaz3vVffO9OIllG5lSi6YSST rzh2z+p4F2Xfy6VOiH66Igjr9ERY3NnaEcp7t0L4US7osbDxByem61gJ5vQM/TAtnr QftLAd83g7k7l+zmgtCwVhyqc+sVPHAatE61mLhA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405410AbgJPJH0 (ORCPT ); Fri, 16 Oct 2020 05:07:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:35358 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405387AbgJPJHP (ORCPT ); Fri, 16 Oct 2020 05:07:15 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 7338620878; Fri, 16 Oct 2020 09:07:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602839235; bh=UmtclSfZhXzimd9NuXcKtwuugePYD7UcrFRljjiXOE8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xvGeH9i9UkmGVBtU1Am4UMO6F/b4iCcqRG2RFI7bUSukK/RFpV5NCPyNNlSZvBlTA wzRRoasAVt3JwtyfCiy0dJDON8tDPG4aQaE6ACPG4NLHt1O9DjJn1yoocXlKCzHs74 8LvZgUCIt4DQUlX/qqIPmXI1xSvl8myCsPMU+oSQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Neukum , Ben Hutchings , Hans Verkuil , Mauro Carvalho Chehab Subject: [PATCH 4.4 07/16] media: usbtv: Fix refcounting mixup Date: Fri, 16 Oct 2020 11:07:00 +0200 Message-Id: <20201016090435.783530200@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201016090435.423923738@linuxfoundation.org> References: <20201016090435.423923738@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: stable@vger.kernel.org From: Oliver Neukum commit bf65f8aabdb37bc1a785884374e919477fe13e10 upstream. The premature free in the error path is blocked by V4L refcounting, not USB refcounting. Thanks to Ben Hutchings for review. [v2] corrected attributions Signed-off-by: Oliver Neukum Fixes: 50e704453553 ("media: usbtv: prevent double free in error case") CC: stable@vger.kernel.org Reported-by: Ben Hutchings Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/usbtv/usbtv-core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/media/usb/usbtv/usbtv-core.c +++ b/drivers/media/usb/usbtv/usbtv-core.c @@ -96,7 +96,8 @@ static int usbtv_probe(struct usb_interf usbtv_audio_fail: /* we must not free at this point */ - usb_get_dev(usbtv->udev); + v4l2_device_get(&usbtv->v4l2_dev); + /* this will undo the v4l2_device_get() */ usbtv_video_free(usbtv); usbtv_video_fail: