From patchwork Fri Apr 9 09:01:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Colin King X-Patchwork-Id: 12193421 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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 897A1C433B4 for ; Fri, 9 Apr 2021 09:03:03 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F3DF8610A3 for ; Fri, 9 Apr 2021 09:03:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F3DF8610A3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=canonical.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=RTq/1vhKkgrCrJ2q7J66eordoDTwxGA25Vx4ZIzoca0=; b=jNC00xn7r+injc9q9F3F35gXE9 cnkxisLabfNYt1mqROVAqmqiyoPPZeVkY4B1Thcnj8ApEgNtjlSekCJmLU0KEFI5CqHYyP8O4pXd+ +A9ARAnSbNyLp60Zv+YIW3F3iQvqOYasC0ggSrhFVQytAVqUweUS1zj2tDlQKvvV9K+lgH1y7dJ46 OYfhcId4EpyYr0jEs3jvfDvPdrtQEmOJ7Y9qIRiQ1fxvbJDPsEJGvEuI/SiWkVdLWhK5Dzxzpr1i1 oGZG9O6ws2k6wJp28BQEsxUNmPWLP3aAf8O8qMzeLkkx3Frs2EkPAmV9CemIfl28r6LfviWpxd2ji Ok+KNsXw==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lUn0x-0009HV-88; Fri, 09 Apr 2021 09:01:19 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lUn0n-0009Es-Kh for linux-arm-kernel@lists.infradead.org; Fri, 09 Apr 2021 09:01:12 +0000 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1lUn0j-0002Ay-6v; Fri, 09 Apr 2021 09:01:05 +0000 From: Colin King To: Michael Turquette , Stephen Boyd , Masahiro Yamada , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][V2] clk: uniphier: Fix potential infinite loop Date: Fri, 9 Apr 2021 10:01:03 +0100 Message-Id: <20210409090104.629722-1-colin.king@canonical.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210409_100110_862886_113AF1E2 X-CRM114-Status: GOOD ( 12.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Colin Ian King The for-loop iterates with a u8 loop counter i and compares this with the loop upper limit of num_parents that is an int type. There is a potential infinite loop if num_parents is larger than the u8 loop counter. Fix this by making the loop counter the same type as num_parents. Also make num_parents an unsigned int to match the return type of the call to clk_hw_get_num_parents. Addresses-Coverity: ("Infinite loop") Fixes: 734d82f4a678 ("clk: uniphier: add core support code for UniPhier clock driver") Signed-off-by: Colin Ian King --- V2: Make num_parents an unsigned int to match return type of clk_hw_get_num_parents(). --- drivers/clk/uniphier/clk-uniphier-mux.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/clk/uniphier/clk-uniphier-mux.c b/drivers/clk/uniphier/clk-uniphier-mux.c index 462c84321b2d..1998e9d4cfc0 100644 --- a/drivers/clk/uniphier/clk-uniphier-mux.c +++ b/drivers/clk/uniphier/clk-uniphier-mux.c @@ -31,10 +31,10 @@ static int uniphier_clk_mux_set_parent(struct clk_hw *hw, u8 index) static u8 uniphier_clk_mux_get_parent(struct clk_hw *hw) { struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw); - int num_parents = clk_hw_get_num_parents(hw); + unsigned int num_parents = clk_hw_get_num_parents(hw); int ret; unsigned int val; - u8 i; + unsigned int i; ret = regmap_read(mux->regmap, mux->reg, &val); if (ret)