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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 905A2C388F9 for ; Tue, 27 Oct 2020 17:54:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 396F92076D for ; Tue, 27 Oct 2020 17:54:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603821258; bh=4jgBDNDDLCYTROeaIBS1cIReG+r24LTtVq0TEdijb8s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Envr2hyXUR8B1cc61g5485kdOtlA7gvGOscwPeHyoDFUOqYPC4y27VASwykk1wMzN FCuHmlcuVwBErL34a9QwAN5PLwYBr34nU6VGTnzY/X/CqjbA6mPSSpD5QTUj95TFEg E7+HqHolvstN9cfquaK6QmzH7M/ND4/TjOIvR90s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1822923AbgJ0RyK (ORCPT ); Tue, 27 Oct 2020 13:54:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:47478 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2443825AbgJ0OWt (ORCPT ); Tue, 27 Oct 2020 10:22:49 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4E61A206ED; Tue, 27 Oct 2020 14:22:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603808568; bh=4jgBDNDDLCYTROeaIBS1cIReG+r24LTtVq0TEdijb8s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TIt/BmcH3lOBiWdEdeITestt29tQX6GOQGcWeoeC9mnERwR5RTHSNumwTwgfct3nn niGjwdypII5wsaLP+vzbc9nj9JeJ9ENjyV5mXJFJnQ7mKVxKhhJ2HO3RK6CGAbOw4k 9CGzxVOH0TxlomlXu6LrMwCliHqE/TH2A6oS9Mcs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Darrick J. Wong" , Christoph Hellwig , Chandan Babu R , Sasha Levin Subject: [PATCH 4.19 140/264] xfs: limit entries returned when counting fsmap records Date: Tue, 27 Oct 2020 14:53:18 +0100 Message-Id: <20201027135437.262433510@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135430.632029009@linuxfoundation.org> References: <20201027135430.632029009@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: Darrick J. Wong [ Upstream commit acd1ac3aa22fd58803a12d26b1ab7f70232f8d8d ] If userspace asked fsmap to count the number of entries, we cannot return more than UINT_MAX entries because fmh_entries is u32. Therefore, stop counting if we hit this limit or else we will waste time to return truncated results. Fixes: e89c041338ed ("xfs: implement the GETFSMAP ioctl") Signed-off-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Reviewed-by: Chandan Babu R Signed-off-by: Sasha Levin --- fs/xfs/xfs_fsmap.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 3d76a9e35870a..75b57b683d3e6 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -259,6 +259,9 @@ xfs_getfsmap_helper( /* Are we just counting mappings? */ if (info->head->fmh_count == 0) { + if (info->head->fmh_entries == UINT_MAX) + return -ECANCELED; + if (rec_daddr > info->next_daddr) info->head->fmh_entries++; -- 2.25.1