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 B588EC001DF for ; Tue, 25 Jul 2023 11:35:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234727AbjGYLfG (ORCPT ); Tue, 25 Jul 2023 07:35:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234723AbjGYLfE (ORCPT ); Tue, 25 Jul 2023 07:35:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 454C6F3 for ; Tue, 25 Jul 2023 04:35:03 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id CEA8C616A2 for ; Tue, 25 Jul 2023 11:35:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D9C07C433C8; Tue, 25 Jul 2023 11:35:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690284902; bh=nB/j9ko/crfZNXOgrM1pS36HfpQh4D+eyje+BmMX4ro=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=07MiwPUkWgYoMp9HsQi9AxQDmpmhLE1zPi+YbOO37msuiqdRiM/4WhRQjm10HEQ4m 2Q+cD5uXRxj1285/tRRsNz7ghqJhfBqlSjTusrKzMdo9jg+XK40dgYDIMa+UkxA8Bz dbDMxgd9ppHrESozOOwYF282XfUo4eYmrPD1oles= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Li Nan , Song Liu , Sasha Levin Subject: [PATCH 5.4 013/313] md/raid10: fix overflow of md/safe_mode_delay Date: Tue, 25 Jul 2023 12:42:46 +0200 Message-ID: <20230725104521.745928440@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230725104521.167250627@linuxfoundation.org> References: <20230725104521.167250627@linuxfoundation.org> User-Agent: quilt/0.67 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: Li Nan [ Upstream commit 6beb489b2eed25978523f379a605073f99240c50 ] There is no input check when echo md/safe_mode_delay in safe_delay_store(). And msec might also overflow when HZ < 1000 in safe_delay_show(), Fix it by checking overflow in safe_delay_store() and use unsigned long conversion in safe_delay_show(). Fixes: 72e02075a33f ("md: factor out parsing of fixed-point numbers") Signed-off-by: Li Nan Signed-off-by: Song Liu Link: https://lore.kernel.org/r/20230522072535.1523740-2-linan666@huaweicloud.com Signed-off-by: Sasha Levin --- drivers/md/md.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 64558991ce0a0..bae264aae3cd0 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3766,8 +3766,9 @@ int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) static ssize_t safe_delay_show(struct mddev *mddev, char *page) { - int msec = (mddev->safemode_delay*1000)/HZ; - return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); + unsigned int msec = ((unsigned long)mddev->safemode_delay*1000)/HZ; + + return sprintf(page, "%u.%03u\n", msec/1000, msec%1000); } static ssize_t safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) @@ -3779,7 +3780,7 @@ safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) return -EINVAL; } - if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) + if (strict_strtoul_scaled(cbuf, &msec, 3) < 0 || msec > UINT_MAX / HZ) return -EINVAL; if (msec == 0) mddev->safemode_delay = 0; -- 2.39.2