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 C5F05CCA482 for ; Fri, 3 Jun 2022 17:56:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345746AbiFCR4T (ORCPT ); Fri, 3 Jun 2022 13:56:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59868 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345953AbiFCRza (ORCPT ); Fri, 3 Jun 2022 13:55:30 -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 E8C6D65C8; Fri, 3 Jun 2022 10:53:07 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 748AB612EA; Fri, 3 Jun 2022 17:53:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 832D4C385A9; Fri, 3 Jun 2022 17:53:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654278786; bh=C5arwU05RqA1ctL2UY79lqz2JT3jbYppZjc/zSBAfIc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TPhsYbPtOIYj6OEJYNyzqRVlwoocFzio7hpCmr44uknYDPkOGhKUXZ1CFpQUR0I1J 30i143PlcwabYRPzayzy2chjMGOPqEvgoTF6dH57z+Y6v0nCk+Ae9zNaYEUEO5rrve VpcKJrJNuOrzY0eUX30F4ozYPoAbmXAUlC0yTpkU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+a4087e40b9c13aad7892@syzkaller.appspotmail.com, Tadeusz Struk , Sungjong Seo , Namjae Jeon Subject: [PATCH 5.17 19/75] exfat: check if cluster num is valid Date: Fri, 3 Jun 2022 19:43:03 +0200 Message-Id: <20220603173822.293395249@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220603173821.749019262@linuxfoundation.org> References: <20220603173821.749019262@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: Tadeusz Struk commit 64ba4b15e5c045f8b746c6da5fc9be9a6b00b61d upstream. Syzbot reported slab-out-of-bounds read in exfat_clear_bitmap. This was triggered by reproducer calling truncute with size 0, which causes the following trace: BUG: KASAN: slab-out-of-bounds in exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 Read of size 8 at addr ffff888115aa9508 by task syz-executor251/365 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 exfat_clear_bitmap+0x147/0x490 fs/exfat/balloc.c:174 exfat_free_cluster+0x25a/0x4a0 fs/exfat/fatent.c:181 __exfat_truncate+0x99e/0xe00 fs/exfat/file.c:217 exfat_truncate+0x11b/0x4f0 fs/exfat/file.c:243 exfat_setattr+0xa03/0xd40 fs/exfat/file.c:339 notify_change+0xb76/0xe10 fs/attr.c:336 do_truncate+0x1ea/0x2d0 fs/open.c:65 Move the is_valid_cluster() helper from fatent.c to a common header to make it reusable in other *.c files. And add is_valid_cluster() to validate if cluster number is within valid range in exfat_clear_bitmap() and exfat_set_bitmap(). Link: https://syzkaller.appspot.com/bug?id=50381fc73821ecae743b8cf24b4c9a04776f767c Reported-by: syzbot+a4087e40b9c13aad7892@syzkaller.appspotmail.com Fixes: 1e49a94cf707 ("exfat: add bitmap operations") Cc: stable@vger.kernel.org # v5.7+ Signed-off-by: Tadeusz Struk Reviewed-by: Sungjong Seo Signed-off-by: Namjae Jeon Signed-off-by: Greg Kroah-Hartman --- fs/exfat/balloc.c | 8 ++++++-- fs/exfat/exfat_fs.h | 6 ++++++ fs/exfat/fatent.c | 6 ------ 3 files changed, 12 insertions(+), 8 deletions(-) --- a/fs/exfat/balloc.c +++ b/fs/exfat/balloc.c @@ -148,7 +148,9 @@ int exfat_set_bitmap(struct inode *inode struct super_block *sb = inode->i_sb; struct exfat_sb_info *sbi = EXFAT_SB(sb); - WARN_ON(clu < EXFAT_FIRST_CLUSTER); + if (!is_valid_cluster(sbi, clu)) + return -EINVAL; + ent_idx = CLUSTER_TO_BITMAP_ENT(clu); i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent_idx); b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent_idx); @@ -166,7 +168,9 @@ void exfat_clear_bitmap(struct inode *in struct exfat_sb_info *sbi = EXFAT_SB(sb); struct exfat_mount_options *opts = &sbi->options; - WARN_ON(clu < EXFAT_FIRST_CLUSTER); + if (!is_valid_cluster(sbi, clu)) + return; + ent_idx = CLUSTER_TO_BITMAP_ENT(clu); i = BITMAP_OFFSET_SECTOR_INDEX(sb, ent_idx); b = BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent_idx); --- a/fs/exfat/exfat_fs.h +++ b/fs/exfat/exfat_fs.h @@ -380,6 +380,12 @@ static inline int exfat_sector_to_cluste EXFAT_RESERVED_CLUSTERS; } +static inline bool is_valid_cluster(struct exfat_sb_info *sbi, + unsigned int clus) +{ + return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters; +} + /* super.c */ int exfat_set_volume_dirty(struct super_block *sb); int exfat_clear_volume_dirty(struct super_block *sb); --- a/fs/exfat/fatent.c +++ b/fs/exfat/fatent.c @@ -81,12 +81,6 @@ int exfat_ent_set(struct super_block *sb return 0; } -static inline bool is_valid_cluster(struct exfat_sb_info *sbi, - unsigned int clus) -{ - return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters; -} - int exfat_ent_get(struct super_block *sb, unsigned int loc, unsigned int *content) {