From patchwork Thu Dec 8 08:06:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yuan Can X-Patchwork-Id: 13068068 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 713CBC63705 for ; Thu, 8 Dec 2022 08:08:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229685AbiLHII5 (ORCPT ); Thu, 8 Dec 2022 03:08:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229462AbiLHII4 (ORCPT ); Thu, 8 Dec 2022 03:08:56 -0500 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2743155AAF; Thu, 8 Dec 2022 00:08:55 -0800 (PST) Received: from dggpeml500024.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4NSRbm0pfZzJqJG; Thu, 8 Dec 2022 16:08:04 +0800 (CST) Received: from huawei.com (10.175.112.208) by dggpeml500024.china.huawei.com (7.185.36.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Thu, 8 Dec 2022 16:08:52 +0800 From: Yuan Can To: , , , , , , , , , , , CC: Subject: [PATCH] media: i2c: ov772x: Fix memleak in ov772x_probe() Date: Thu, 8 Dec 2022 08:06:25 +0000 Message-ID: <20221208080625.130392-1-yuancan@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.175.112.208] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpeml500024.china.huawei.com (7.185.36.10) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org A memory leak was reported when testing ov772x with bpf mock device: AssertionError: unreferenced object 0xffff888109afa7a8 (size 8): comm "python3", pid 279, jiffies 4294805921 (age 20.681s) hex dump (first 8 bytes): 80 22 88 15 81 88 ff ff ."...... backtrace: [<000000009990b438>] __kmalloc_node+0x44/0x1b0 [<000000009e32f7d7>] kvmalloc_node+0x34/0x180 [<00000000faf48134>] v4l2_ctrl_handler_init_class+0x11d/0x180 [videodev] [<00000000da376937>] ov772x_probe+0x1c3/0x68c [ov772x] [<000000003f0d225e>] i2c_device_probe+0x28d/0x680 [<00000000e0b6db89>] really_probe+0x17c/0x3f0 [<000000001b19fcee>] __driver_probe_device+0xe3/0x170 [<0000000048370519>] driver_probe_device+0x49/0x120 [<000000005ead07a0>] __device_attach_driver+0xf7/0x150 [<0000000043f452b8>] bus_for_each_drv+0x114/0x180 [<00000000358e5596>] __device_attach+0x1e5/0x2d0 [<0000000043f83c5d>] bus_probe_device+0x126/0x140 [<00000000ee0f3046>] device_add+0x810/0x1130 [<00000000e0278184>] i2c_new_client_device+0x359/0x4f0 [<0000000070baf34f>] of_i2c_register_device+0xf1/0x110 [<00000000a9f2159d>] of_i2c_notify+0x100/0x160 unreferenced object 0xffff888119825c00 (size 256): comm "python3", pid 279, jiffies 4294805921 (age 20.681s) hex dump (first 32 bytes): 00 b4 a5 17 81 88 ff ff 00 5e 82 19 81 88 ff ff .........^...... 10 5c 82 19 81 88 ff ff 10 5c 82 19 81 88 ff ff .\.......\...... backtrace: [<000000009990b438>] __kmalloc_node+0x44/0x1b0 [<000000009e32f7d7>] kvmalloc_node+0x34/0x180 [<0000000073d88e0b>] v4l2_ctrl_new.cold+0x19b/0x86f [videodev] [<00000000b1f576fb>] v4l2_ctrl_new_std+0x16f/0x210 [videodev] [<00000000caf7ac99>] ov772x_probe+0x1fa/0x68c [ov772x] [<000000003f0d225e>] i2c_device_probe+0x28d/0x680 [<00000000e0b6db89>] really_probe+0x17c/0x3f0 [<000000001b19fcee>] __driver_probe_device+0xe3/0x170 [<0000000048370519>] driver_probe_device+0x49/0x120 [<000000005ead07a0>] __device_attach_driver+0xf7/0x150 [<0000000043f452b8>] bus_for_each_drv+0x114/0x180 [<00000000358e5596>] __device_attach+0x1e5/0x2d0 [<0000000043f83c5d>] bus_probe_device+0x126/0x140 [<00000000ee0f3046>] device_add+0x810/0x1130 [<00000000e0278184>] i2c_new_client_device+0x359/0x4f0 [<0000000070baf34f>] of_i2c_register_device+0xf1/0x110 The reason is that if priv->hdl.error is set, ov772x_probe() jumps to the error_mutex_destroy without doing v4l2_ctrl_handler_free(), and all resources allocated in v4l2_ctrl_handler_init() and v4l2_ctrl_new_std() are leaked. Fixes: 1112babde214 ("media: i2c: Copy ov772x soc_camera sensor driver") Signed-off-by: Yuan Can Reviewed-by: Laurent Pinchart --- drivers/media/i2c/ov772x.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/media/i2c/ov772x.c b/drivers/media/i2c/ov772x.c index 4189e3fc3d53..a238e63425f8 100644 --- a/drivers/media/i2c/ov772x.c +++ b/drivers/media/i2c/ov772x.c @@ -1462,7 +1462,7 @@ static int ov772x_probe(struct i2c_client *client) priv->subdev.ctrl_handler = &priv->hdl; if (priv->hdl.error) { ret = priv->hdl.error; - goto error_mutex_destroy; + goto error_ctrl_free; } priv->clk = clk_get(&client->dev, NULL); @@ -1515,7 +1515,6 @@ static int ov772x_probe(struct i2c_client *client) clk_put(priv->clk); error_ctrl_free: v4l2_ctrl_handler_free(&priv->hdl); -error_mutex_destroy: mutex_destroy(&priv->lock); return ret;