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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 11324C072B1 for ; Thu, 30 May 2019 06:56:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E35B125AF4 for ; Thu, 30 May 2019 06:56:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727297AbfE3G4E (ORCPT ); Thu, 30 May 2019 02:56:04 -0400 Received: from muru.com ([72.249.23.125]:51854 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726743AbfE3G4E (ORCPT ); Thu, 30 May 2019 02:56:04 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id E6E7A803A; Thu, 30 May 2019 06:56:23 +0000 (UTC) From: Tony Lindgren To: Michael Turquette , Stephen Boyd , Tero Kristo Cc: devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-omap@vger.kernel.org, Peter Ujfalusi , Tomi Valkeinen Subject: [PATCH] clk: ti: clkctrl: Fix returning uninitialized data Date: Wed, 29 May 2019 23:55:57 -0700 Message-Id: <20190530065557.42741-1-tony@atomide.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org If we do a clk_get() for a clock that does not exists, we have _ti_omap4_clkctrl_xlate() return uninitialized data if no match is found. This can be seen in some cases with SLAB_DEBUG enabled: Unable to handle kernel paging request at virtual address 5a5a5a5a ... clk_hw_create_clk.part.33 sysc_notifier_call notifier_call_chain blocking_notifier_call_chain device_add Let's fix this by setting a found flag only when we find a match. Cc: Peter Ujfalusi Cc: Tomi Valkeinen Reported-by: Tomi Valkeinen Fixes: 88a172526c32 ("clk: ti: add support for clkctrl clocks") Signed-off-by: Tony Lindgren --- drivers/clk/ti/clkctrl.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/clk/ti/clkctrl.c b/drivers/clk/ti/clkctrl.c --- a/drivers/clk/ti/clkctrl.c +++ b/drivers/clk/ti/clkctrl.c @@ -229,6 +229,7 @@ static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec, { struct omap_clkctrl_provider *provider = data; struct omap_clkctrl_clk *entry; + bool found = false; if (clkspec->args_count != 2) return ERR_PTR(-EINVAL); @@ -238,11 +239,13 @@ static struct clk_hw *_ti_omap4_clkctrl_xlate(struct of_phandle_args *clkspec, list_for_each_entry(entry, &provider->clocks, node) { if (entry->reg_offset == clkspec->args[0] && - entry->bit_offset == clkspec->args[1]) + entry->bit_offset == clkspec->args[1]) { + found = true; break; + } } - if (!entry) + if (!found) return ERR_PTR(-EINVAL); return entry->clk; -- 2.21.0