From patchwork Tue Apr 5 07:26:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 557425 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 F1931C43217 for ; Tue, 5 Apr 2022 10:04:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350401AbiDEJ6B (ORCPT ); Tue, 5 Apr 2022 05:58:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343993AbiDEJQo (ORCPT ); Tue, 5 Apr 2022 05:16:44 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 682E1FD0A; Tue, 5 Apr 2022 02:02:45 -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 1E555B818F3; Tue, 5 Apr 2022 09:02:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E5C1C385A1; Tue, 5 Apr 2022 09:02:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649149362; bh=/1H7jgttM8tlsVKJuW8/6RMCnsQhUWt4es66wJrijig=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S9cPhsOL3EpOeI/Ezbvy2qW2ThJtZiP4MZ/jftuz46uM1yWGDrL4FQoa/ZRRuZwZr PDRWI26/O2CMxSpNuq7MG7Dv7vE5ZyUtmBh/4Yhgd6XgCptHmW8ta67ifdeDUNfw2G Rsl6aDOWQBX+EJnRGTmf/UNUyJfrDUTMmBMFbJ2k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Maxime Ripard , Stephen Boyd , Sasha Levin Subject: [PATCH 5.16 0688/1017] clk: Fix clk_hw_get_clk() when dev is NULL Date: Tue, 5 Apr 2022 09:26:41 +0200 Message-Id: <20220405070414.698335131@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070354.155796697@linuxfoundation.org> References: <20220405070354.155796697@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Maxime Ripard [ Upstream commit 0c1b56df451716ba207bbf59f303473643eee4fd ] Any registered clk_core structure can have a NULL pointer in its dev field. While never actually documented, this is evidenced by the wide usage of clk_register and clk_hw_register with a NULL device pointer, and the fact that the core of_clk_hw_register() function also passes a NULL device pointer. A call to clk_hw_get_clk() on a clk_hw struct whose clk_core is in that case will result in a NULL pointer derefence when it calls dev_name() on that NULL device pointer. Add a test for this case and use NULL as the dev_id if the device pointer is NULL. Fixes: 30d6f8c15d2c ("clk: add api to get clk consumer from clk_hw") Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20220225143534.405820-2-maxime@cerno.tech Signed-off-by: Stephen Boyd Signed-off-by: Sasha Levin --- drivers/clk/clk.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 21b17d6ced6d..e55ddc12ed53 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -3733,8 +3733,9 @@ struct clk *clk_hw_create_clk(struct device *dev, struct clk_hw *hw, struct clk *clk_hw_get_clk(struct clk_hw *hw, const char *con_id) { struct device *dev = hw->core->dev; + const char *name = dev ? dev_name(dev) : NULL; - return clk_hw_create_clk(dev, hw, dev_name(dev), con_id); + return clk_hw_create_clk(dev, hw, name, con_id); } EXPORT_SYMBOL(clk_hw_get_clk);