Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752272AbeAAO01 (ORCPT + 1 other); Mon, 1 Jan 2018 09:26:27 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:41926 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751975AbeAAO0Z (ORCPT ); Mon, 1 Jan 2018 09:26:25 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Peter Ujfalusi , Lee Jones Subject: [PATCH 4.4 04/63] mfd: twl4030-audio: Fix sibling-node lookup Date: Mon, 1 Jan 2018 15:24:22 +0100 Message-Id: <20180101140043.267686809@linuxfoundation.org> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180101140042.456380281@linuxfoundation.org> References: <20180101140042.456380281@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 0a423772de2f3d7b00899987884f62f63ae00dcb upstream. A helper purported to look up a child node based on its name was using the wrong of-helper and ended up prematurely freeing the parent of-node while leaking any matching node. To make things worse, any matching node would not even necessarily be a child node as the whole device tree was searched depth-first starting at the parent. Fixes: 019a7e6b7b31 ("mfd: twl4030-audio: Add DT support") Signed-off-by: Johan Hovold Acked-by: Peter Ujfalusi Signed-off-by: Lee Jones Signed-off-by: Greg Kroah-Hartman --- drivers/mfd/twl4030-audio.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/drivers/mfd/twl4030-audio.c +++ b/drivers/mfd/twl4030-audio.c @@ -159,13 +159,18 @@ unsigned int twl4030_audio_get_mclk(void EXPORT_SYMBOL_GPL(twl4030_audio_get_mclk); static bool twl4030_audio_has_codec(struct twl4030_audio_data *pdata, - struct device_node *node) + struct device_node *parent) { + struct device_node *node; + if (pdata && pdata->codec) return true; - if (of_find_node_by_name(node, "codec")) + node = of_get_child_by_name(parent, "codec"); + if (node) { + of_node_put(node); return true; + } return false; }