From nobody Sat Feb 7 11:31:21 2026 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 55B0AC433FE for ; Mon, 23 May 2022 17:25:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240724AbiEWRZw (ORCPT ); Mon, 23 May 2022 13:25:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240584AbiEWRQb (ORCPT ); Mon, 23 May 2022 13:16:31 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D90B218B14; Mon, 23 May 2022 10:16:01 -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 ams.source.kernel.org (Postfix) with ESMTPS id 1B86FB811FF; Mon, 23 May 2022 17:15:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F14CC385AA; Mon, 23 May 2022 17:15:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1653326155; bh=i0KI2DIKLOqwlUJlNTYpiFF1wIkrVlWryaAXiVH79EA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s7YnOpM3qlleS15lBeVz+nOPCybNTyv7rrjevpVORARNc02oieMHZtfyZpOvqNQoa OsoYKePyqB3dg4nEMwYpx8whxi2iqG4WLg/12DuU2SbEdV2UmcMX5L6euafGXoE62m TZU14Jiolyh6+NUm2nhq/kCtVin6CL5VjKK9U9ug= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , Guo Xuenan , Christoph Hellwig , "Darrick J. Wong" , Sasha Levin Subject: [PATCH 5.10 24/97] fs: fix an infinite loop in iomap_fiemap Date: Mon, 23 May 2022 19:05:28 +0200 Message-Id: <20220523165816.069605342@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220523165812.244140613@linuxfoundation.org> References: <20220523165812.244140613@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Guo Xuenan [ Upstream commit 49df34221804cfd6384135b28b03c9461a31d024 ] when get fiemap starting from MAX_LFS_FILESIZE, (maxbytes - *len) < start will always true , then *len set zero. because of start offset is beyond file size, for erofs filesystem it will always return iomap.length with zero,iomap iterate will enter infinite loop. it is necessary cover this corner case to avoid this situation. Reported-by: Hulk Robot Reviewed-by: Christoph Hellwig Reviewed-by: Darrick J. Wong ------------[ cut here ]------------ WARNING: CPU: 7 PID: 905 at fs/iomap/iter.c:35 iomap_iter+0x97f/0xc70 Modules linked in: xfs erofs CPU: 7 PID: 905 Comm: iomap Tainted: G W 5.17.0-rc8 #27 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1= .1 04/01/2014 RIP: 0010:iomap_iter+0x97f/0xc70 Code: 85 a1 fc ff ff e8 71 be 9c ff 0f 1f 44 00 00 e9 92 fc ff ff e8 62 be = 9c ff 0f 0b b8 fb ff ff ff e9 fc f8 ff ff e8 51 be 9c ff <0f> 0b e9 2b fc f= f ff e8 45 be 9c ff 0f 0b e9 e1 fb ff ff e8 39 be RSP: 0018:ffff888060a37ab0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888060a37bb0 RCX: 0000000000000000 RDX: ffff88807e19a900 RSI: ffffffff81a7da7f RDI: ffff888060a37be0 RBP: 7fffffffffffffff R08: 0000000000000000 R09: ffff888060a37c20 R10: ffff888060a37c67 R11: ffffed100c146f8c R12: 7fffffffffffffff R13: 0000000000000000 R14: ffff888060a37bd8 R15: ffff888060a37c20 FS: 00007fd3cca01540(0000) GS:ffff888108780000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010820 CR3: 0000000054b92000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: iomap_fiemap+0x1c9/0x2f0 erofs_fiemap+0x64/0x90 [erofs] do_vfs_ioctl+0x40d/0x12e0 __x64_sys_ioctl+0xaa/0x1c0 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae ---[ end trace 0000000000000000 ]--- watchdog: BUG: soft lockup - CPU#7 stuck for 26s! [iomap:905] Reported-by: Hulk Robot Signed-off-by: Guo Xuenan Reviewed-by: Christoph Hellwig [djwong: fix some typos] Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong Signed-off-by: Sasha Levin --- fs/ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/ioctl.c b/fs/ioctl.c index 4e6cc0a7d69c..7bcc60091287 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -170,7 +170,7 @@ int fiemap_prep(struct inode *inode, struct fiemap_exte= nt_info *fieinfo, =20 if (*len =3D=3D 0) return -EINVAL; - if (start > maxbytes) + if (start >=3D maxbytes) return -EFBIG; =20 /* --=20 2.35.1