From patchwork Fri Jul 27 11:52:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Vasilyev X-Patchwork-Id: 10546953 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D46321822 for ; Fri, 27 Jul 2018 11:52:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C31412B5CF for ; Fri, 27 Jul 2018 11:52:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B6BBF2B45C; Fri, 27 Jul 2018 11:52:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3E4302B45C for ; Fri, 27 Jul 2018 11:52:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732199AbeG0NOH (ORCPT ); Fri, 27 Jul 2018 09:14:07 -0400 Received: from bran.ispras.ru ([83.149.199.196]:19599 "EHLO smtp.ispras.ru" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730126AbeG0NOG (ORCPT ); Fri, 27 Jul 2018 09:14:06 -0400 Received: from myklebust.intra.ispras.ru (unknown [10.10.2.207]) by smtp.ispras.ru (Postfix) with ESMTP id 872C4203B2; Fri, 27 Jul 2018 14:52:31 +0300 (MSK) From: Anton Vasilyev To: "Lad, Prabhakar" Cc: Anton Vasilyev , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, ldv-project@linuxtesting.org Subject: [PATCH] media: davinci: vpif_display: Mix memory leak on probe error path Date: Fri, 27 Jul 2018 14:52:20 +0300 Message-Id: <20180727115220.10991-1-vasilyev@ispras.ru> X-Mailer: git-send-email 2.18.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If vpif_probe() fails on v4l2_device_register() then memory allocated at initialize_vpif() for global vpif_obj.dev[i] become unreleased. The patch adds deallocation of vpif_obj.dev[i] on the error path and removes duplicated check on platform_data presence. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Anton Vasilyev --- drivers/media/platform/davinci/vpif_display.c | 24 ++++++++++++------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/drivers/media/platform/davinci/vpif_display.c b/drivers/media/platform/davinci/vpif_display.c index 7be636237acf..0f324055cc9f 100644 --- a/drivers/media/platform/davinci/vpif_display.c +++ b/drivers/media/platform/davinci/vpif_display.c @@ -1114,6 +1114,14 @@ static int initialize_vpif(void) return err; } +static void free_vpif_objs(void) +{ + int i; + + for (i = 0; i < VPIF_DISPLAY_MAX_DEVICES; i++) + kfree(vpif_obj.dev[i]); +} + static int vpif_async_bound(struct v4l2_async_notifier *notifier, struct v4l2_subdev *subdev, struct v4l2_async_subdev *asd) @@ -1255,11 +1263,6 @@ static __init int vpif_probe(struct platform_device *pdev) return -EINVAL; } - if (!pdev->dev.platform_data) { - dev_warn(&pdev->dev, "Missing platform data. Giving up.\n"); - return -EINVAL; - } - vpif_dev = &pdev->dev; err = initialize_vpif(); @@ -1271,7 +1274,7 @@ static __init int vpif_probe(struct platform_device *pdev) err = v4l2_device_register(vpif_dev, &vpif_obj.v4l2_dev); if (err) { v4l2_err(vpif_dev->driver, "Error registering v4l2 device\n"); - return err; + goto vpif_free; } while ((res = platform_get_resource(pdev, IORESOURCE_IRQ, res_idx))) { @@ -1314,7 +1317,10 @@ static __init int vpif_probe(struct platform_device *pdev) if (vpif_obj.sd[i]) vpif_obj.sd[i]->grp_id = 1 << i; } - vpif_probe_complete(); + err = vpif_probe_complete(); + if (err) { + goto probe_subdev_out; + } } else { vpif_obj.notifier.subdevs = vpif_obj.config->asd; vpif_obj.notifier.num_subdevs = vpif_obj.config->asd_sizes[0]; @@ -1334,6 +1340,8 @@ static __init int vpif_probe(struct platform_device *pdev) kfree(vpif_obj.sd); vpif_unregister: v4l2_device_unregister(&vpif_obj.v4l2_dev); +vpif_free: + free_vpif_objs(); return err; } @@ -1355,8 +1363,8 @@ static int vpif_remove(struct platform_device *device) ch = vpif_obj.dev[i]; /* Unregister video device */ video_unregister_device(&ch->video_dev); - kfree(vpif_obj.dev[i]); } + free_vpif_objs(); return 0; }