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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 10A82C433F5 for ; Tue, 16 Nov 2021 01:08:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFCA4619BB for ; Tue, 16 Nov 2021 01:08:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377369AbhKPBLV (ORCPT ); Mon, 15 Nov 2021 20:11:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:44624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245418AbhKOTUc (ORCPT ); Mon, 15 Nov 2021 14:20:32 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 76DB9632DD; Mon, 15 Nov 2021 18:34:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637001257; bh=2EB5byPxcAuX5c/jOnmo+iZb51flVzpcuOiBYf9dOA4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yAMwMuj085Q2rhyM6EMth/mpXmskVu/s/rxAtSjWTv6ocwJO54ma0E4oXfFUHMFUn EOm79lv5UOsMzmsh0B983xQLYbiuITGYW63dOja9bfWNyeFmFGuy6/4vwgSlP1tkV0 pnjuEbgeoCPtaCaUO97Q652YI0w3P2hSN6F5LyRI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , Yang Yingliang , Stable@vger.kernel.org, Jonathan Cameron Subject: [PATCH 5.15 120/917] iio: core: check return value when calling dev_set_name() Date: Mon, 15 Nov 2021 17:53:35 +0100 Message-Id: <20211115165432.812076670@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165428.722074685@linuxfoundation.org> References: <20211115165428.722074685@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: Yang Yingliang commit fe6f45f6ba22d625a8500cbad0237c60dd3117ee upstream. I got a null-ptr-deref report when doing fault injection test: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:strlen+0x0/0x20 Call Trace: start_creating+0x199/0x2f0 debugfs_create_dir+0x25/0x430 __iio_device_register+0x4da/0x1b40 [industrialio] __devm_iio_device_register+0x22/0x80 [industrialio] max1027_probe+0x639/0x860 [max1027] spi_probe+0x183/0x210 really_probe+0x285/0xc30 If dev_set_name() fails, the dev_name() is null, check the return value of dev_set_name() to avoid the null-ptr-deref. Reported-by: Hulk Robot Fixes: e553f182d55b ("staging: iio: core: Introduce debugfs support...") Signed-off-by: Yang Yingliang Cc: Link: https://lore.kernel.org/r/20211012063624.3167460-1-yangyingliang@huawei.com Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/industrialio-core.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -1665,7 +1665,13 @@ struct iio_dev *iio_device_alloc(struct kfree(iio_dev_opaque); return NULL; } - dev_set_name(&indio_dev->dev, "iio:device%d", iio_dev_opaque->id); + + if (dev_set_name(&indio_dev->dev, "iio:device%d", iio_dev_opaque->id)) { + ida_simple_remove(&iio_ida, iio_dev_opaque->id); + kfree(iio_dev_opaque); + return NULL; + } + INIT_LIST_HEAD(&iio_dev_opaque->buffer_list); INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);