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=-7.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 44E87C282C5 for ; Thu, 24 Jan 2019 19:26:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0C9EF218FC for ; Thu, 24 Jan 2019 19:26:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548357981; bh=uTS7cSdyQdfICyM3TN5yS6qYxeLYH2+avS2hm8hH25g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=V7ZVvZdZiCgmF9a2pf+Uaaz6a/H+2u7N4n2/WWrcpRbk2wlkLPjH0Q67eTnsVKNVG MMx8pvB555Ahfu9n5TiW+JoZMzPbuzWyizHaB9OM2R0AERDYf2nAwRQFb6AHarYYU7 X/0Cwa3H3KucHLAzelJze1CTv69fcJJg960W6seE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730540AbfAXT0T (ORCPT ); Thu, 24 Jan 2019 14:26:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:52236 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729984AbfAXT0O (ORCPT ); Thu, 24 Jan 2019 14:26:14 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (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 AAE3C218FE; Thu, 24 Jan 2019 19:26:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548357974; bh=uTS7cSdyQdfICyM3TN5yS6qYxeLYH2+avS2hm8hH25g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MCxfQ+4OpwvwnVmx0WPqFCYXa1D9ZDPpEAOAWdUhr+7B/ZzLSzraGXDzh47iyB4xJ jkIn6f0TPQ23O73uR2Wx9V7hGkosA3ms1yA9KDlb/KQ9nJFkE4qGCjUZlrwIf5/nmF 7jqdPoeMKS3Q8a0qIxFs64uzGqzudy3ukKko1ndU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hans Verkuil , syzbot+53d5b2df0d9744411e2e@syzkaller.appspotmail.com, Mauro Carvalho Chehab Subject: [PATCH 4.4 055/104] media: vivid: fix error handling of kthread_run Date: Thu, 24 Jan 2019 20:19:44 +0100 Message-Id: <20190124190201.800159046@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190124190154.968308875@linuxfoundation.org> References: <20190124190154.968308875@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Hans Verkuil commit 701f49bc028edb19ffccd101997dd84f0d71e279 upstream. kthread_run returns an error pointer, but elsewhere in the code dev->kthread_vid_cap/out is checked against NULL. If kthread_run returns an error, then set the pointer to NULL. I chose this method over changing all kthread_vid_cap/out tests elsewhere since this is more robust. Signed-off-by: Hans Verkuil Reported-by: syzbot+53d5b2df0d9744411e2e@syzkaller.appspotmail.com Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/platform/vivid/vivid-kthread-cap.c | 5 ++++- drivers/media/platform/vivid/vivid-kthread-out.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-) --- a/drivers/media/platform/vivid/vivid-kthread-cap.c +++ b/drivers/media/platform/vivid/vivid-kthread-cap.c @@ -863,8 +863,11 @@ int vivid_start_generating_vid_cap(struc "%s-vid-cap", dev->v4l2_dev.name); if (IS_ERR(dev->kthread_vid_cap)) { + int err = PTR_ERR(dev->kthread_vid_cap); + + dev->kthread_vid_cap = NULL; v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n"); - return PTR_ERR(dev->kthread_vid_cap); + return err; } *pstreaming = true; vivid_grab_controls(dev, true); --- a/drivers/media/platform/vivid/vivid-kthread-out.c +++ b/drivers/media/platform/vivid/vivid-kthread-out.c @@ -248,8 +248,11 @@ int vivid_start_generating_vid_out(struc "%s-vid-out", dev->v4l2_dev.name); if (IS_ERR(dev->kthread_vid_out)) { + int err = PTR_ERR(dev->kthread_vid_out); + + dev->kthread_vid_out = NULL; v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n"); - return PTR_ERR(dev->kthread_vid_out); + return err; } *pstreaming = true; vivid_grab_controls(dev, true);