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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8356CC4332F for ; Mon, 18 Apr 2022 13:56:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244177AbiDRN7c (ORCPT ); Mon, 18 Apr 2022 09:59:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244657AbiDRN5J (ORCPT ); Mon, 18 Apr 2022 09:57:09 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D2B262AE0C; Mon, 18 Apr 2022 06:07:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 88A50B80EDB; Mon, 18 Apr 2022 13:07:06 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BAF06C385A1; Mon, 18 Apr 2022 13:07:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650287225; bh=J2ONXweoc+oI4ZYFP4JtxeTGfdvH/g1D9nBQ3EHaCEY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DuomrZz9e/Dj49tEKVLkHvU0TLPKBQs63kFTv26P5eBMADgf58+NJfDp6v3hhUyLg KfaeNSPKpffzUJtJwqFNNvqZ0FUeAKH2Pj54s6tDzVoz9Tr6LTxfAJFoyzxHvEea6d 9Wtpy/+emIjohCeU0t8oq5NpuCp4jnFXCtBJlPPo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jakob Koschel , Michael Ellerman , Sasha Levin Subject: [PATCH 4.9 096/218] powerpc/sysdev: fix incorrect use to determine if list is empty Date: Mon, 18 Apr 2022 14:12:42 +0200 Message-Id: <20220418121202.352333745@linuxfoundation.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220418121158.636999985@linuxfoundation.org> References: <20220418121158.636999985@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: stable@vger.kernel.org From: Jakob Koschel [ Upstream commit fa1321b11bd01752f5be2415e74a0e1a7c378262 ] 'gtm' will *always* be set by list_for_each_entry(). It is incorrect to assume that the iterator value will be NULL if the list is empty. Instead of checking the pointer it should be checked if the list is empty. Fixes: 83ff9dcf375c ("powerpc/sysdev: implement FSL GTM support") Signed-off-by: Jakob Koschel Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220228142434.576226-1-jakobkoschel@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/sysdev/fsl_gtm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/sysdev/fsl_gtm.c b/arch/powerpc/sysdev/fsl_gtm.c index a6f0b96ce2c9..97dee7c99aa0 100644 --- a/arch/powerpc/sysdev/fsl_gtm.c +++ b/arch/powerpc/sysdev/fsl_gtm.c @@ -90,7 +90,7 @@ static LIST_HEAD(gtms); */ struct gtm_timer *gtm_get_timer16(void) { - struct gtm *gtm = NULL; + struct gtm *gtm; int i; list_for_each_entry(gtm, >ms, list_node) { @@ -107,7 +107,7 @@ struct gtm_timer *gtm_get_timer16(void) spin_unlock_irq(>m->lock); } - if (gtm) + if (!list_empty(>ms)) return ERR_PTR(-EBUSY); return ERR_PTR(-ENODEV); } -- 2.34.1