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 50589C4741F for ; Mon, 9 Nov 2020 13:04:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EAAFC2076E for ; Mon, 9 Nov 2020 13:04:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927050; bh=mgiKYMZ1G5/mlLzwZQO8O2vlltscUETpG/xMIDLBWBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Y2vMGjWsiZNpj0rgKoAGvTayPx7Vj4e06OorS4QrR52aOv8Ho7KabDQ1SfpiIsNg8 FUyJil5Xa4FiteLrK0wKjyzvA7UnEcB8qAA08vGaBKOlvqeFw29V8Xt2x0EXjtQprf 8Vxtdzfi9th0Gm5gkTrLpcvFtulwIpAIkIRK8eUQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730730AbgKINEI (ORCPT ); Mon, 9 Nov 2020 08:04:08 -0500 Received: from mail.kernel.org ([198.145.29.99]:55996 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730134AbgKINCD (ORCPT ); Mon, 9 Nov 2020 08:02:03 -0500 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 B3D8E208FE; Mon, 9 Nov 2020 13:01:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604926920; bh=mgiKYMZ1G5/mlLzwZQO8O2vlltscUETpG/xMIDLBWBA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NYK1GZdyx7o+9uvo1PxMFSPCfBdOM2H4xGj3AqfqaSwYiycerK4MXevlvzH8Esbog ztS5+Id5NPNruBuiz2TugJ/9Q8g00uZ9NDRyRw1PUAnJdDF50XwsjDLk3PJHUTHrT1 YUGW1EMwV+MBN0brbS3y+N+dQnrWGr1XN1Uv5jmg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+3698081bcf0bb2d12174@syzkaller.appspotmail.com, Chao Yu , Jaegeuk Kim , Sasha Levin Subject: [PATCH 4.9 019/117] f2fs: fix to check segment boundary during SIT page readahead Date: Mon, 9 Nov 2020 13:54:05 +0100 Message-Id: <20201109125026.559927430@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125025.630721781@linuxfoundation.org> References: <20201109125025.630721781@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: linux-kernel@vger.kernel.org From: Chao Yu [ Upstream commit 6a257471fa42c8c9c04a875cd3a2a22db148e0f0 ] As syzbot reported: kernel BUG at fs/f2fs/segment.h:657! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 16220 Comm: syz-executor.0 Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:f2fs_ra_meta_pages+0xa51/0xdc0 fs/f2fs/segment.h:657 Call Trace: build_sit_entries fs/f2fs/segment.c:4195 [inline] f2fs_build_segment_manager+0x4b8a/0xa3c0 fs/f2fs/segment.c:4779 f2fs_fill_super+0x377d/0x6b80 fs/f2fs/super.c:3633 mount_bdev+0x32e/0x3f0 fs/super.c:1417 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2875 [inline] path_mount+0x1387/0x2070 fs/namespace.c:3192 do_mount fs/namespace.c:3205 [inline] __do_sys_mount fs/namespace.c:3413 [inline] __se_sys_mount fs/namespace.c:3390 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3390 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 @blkno in f2fs_ra_meta_pages could exceed max segment count, causing panic in following sanity check in current_sit_addr(), add check condition to avoid this issue. Reported-by: syzbot+3698081bcf0bb2d12174@syzkaller.appspotmail.com Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/checkpoint.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index c1b24d7aa6ef1..5e9f8ec8251d3 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -201,6 +201,8 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages, blkno * NAT_ENTRY_PER_BLOCK); break; case META_SIT: + if (unlikely(blkno >= TOTAL_SEGS(sbi))) + goto out; /* get sit block addr */ fio.new_blkaddr = current_sit_addr(sbi, blkno * SIT_ENTRY_PER_BLOCK); -- 2.27.0