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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=unavailable 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 DD999C4360F for ; Tue, 2 Apr 2019 13:48:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AC37520856 for ; Tue, 2 Apr 2019 13:48:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732186AbfDBNsx (ORCPT ); Tue, 2 Apr 2019 09:48:53 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:42890 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731196AbfDBNkC (ORCPT ); Tue, 2 Apr 2019 09:40:02 -0400 Received: from [167.98.27.226] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hBJdw-0002nl-Go; Tue, 02 Apr 2019 14:40:00 +0100 Received: from ben by deadeye with local (Exim 4.92) (envelope-from ) id 1hBJdv-0004t4-BE; Tue, 02 Apr 2019 14:39:59 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "Krzysztof Kozlowski" , "Linus Walleij" Date: Tue, 02 Apr 2019 14:38:27 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 33/99] gpiolib: Fix return value of gpio_to_desc() stub if !GPIOLIB In-Reply-To: X-SA-Exim-Connect-IP: 167.98.27.226 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.65-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Krzysztof Kozlowski commit c5510b8dafce5f3f5a039c9b262ebcae0092c462 upstream. If CONFIG_GPOILIB is not set, the stub of gpio_to_desc() should return the same type of error as regular version: NULL. All the callers compare the return value of gpio_to_desc() against NULL, so returned ERR_PTR would be treated as non-error case leading to dereferencing of error value. Fixes: 79a9becda894 ("gpiolib: export descriptor-based GPIO interface") Signed-off-by: Krzysztof Kozlowski Signed-off-by: Linus Walleij Signed-off-by: Ben Hutchings --- include/linux/gpio/consumer.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/gpio/consumer.h +++ b/include/linux/gpio/consumer.h @@ -245,7 +245,7 @@ static inline int gpiod_to_irq(const str static inline struct gpio_desc *gpio_to_desc(unsigned gpio) { - return ERR_PTR(-EINVAL); + return NULL; } static inline int desc_to_gpio(const struct gpio_desc *desc) {