From nobody Fri Dec 19 18:42:52 2025 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 8930BC04A95 for ; Sat, 22 Oct 2022 07:50:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231742AbiJVHut (ORCPT ); Sat, 22 Oct 2022 03:50:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34302 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231703AbiJVHtB (ORCPT ); Sat, 22 Oct 2022 03:49:01 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED59A263F22; Sat, 22 Oct 2022 00:45:48 -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 8B0C960AFD; Sat, 22 Oct 2022 07:42:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9C49BC433C1; Sat, 22 Oct 2022 07:42:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666424544; bh=93Mwl/CNPEa8olUJJ5MXG4cAm7nEoQMxsfLzscJcT+g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PLEl43DJRz1tp4PyNsPW/EQ5TWIFjDGEdpp50autZqm1KM4Cx8ujaKTw6oWfSI6LF uAxUJmz19fcY1kPXaP1B4qh5rhBm7GFlMmBRtA2Go/+4nQB83V6AT2ZCMC0X2rvTqK KqZY4XLjAtsXGfLOUqRm6dO7uX1GHwVFWLVr8Luo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+f966c13b1b4fc0403b19@syzkaller.appspotmail.com, Yue Hu , Gao Xiang , Sasha Levin Subject: [PATCH 5.19 185/717] erofs: fix order >= MAX_ORDER warning due to crafted negative i_size Date: Sat, 22 Oct 2022 09:21:04 +0200 Message-Id: <20221022072448.411194163@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221022072415.034382448@linuxfoundation.org> References: <20221022072415.034382448@linuxfoundation.org> User-Agent: quilt/0.67 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: Gao Xiang [ Upstream commit 1dd73601a1cba37a0ed5f89a8662c90191df5873 ] As syzbot reported [1], the root cause is that i_size field is a signed type, and negative i_size is also less than EROFS_BLKSIZ. As a consequence, it's handled as fast symlink unexpectedly. Let's fall back to the generic path to deal with such unusual i_size. [1] https://lore.kernel.org/r/000000000000ac8efa05e7feaa1f@google.com Reported-by: syzbot+f966c13b1b4fc0403b19@syzkaller.appspotmail.com Fixes: 431339ba9042 ("staging: erofs: add inode operations") Reviewed-by: Yue Hu Link: https://lore.kernel.org/r/20220909023948.28925-1-hsiangkao@linux.alib= aba.com Signed-off-by: Gao Xiang Signed-off-by: Sasha Levin --- fs/erofs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/erofs/inode.c b/fs/erofs/inode.c index 95a403720e8c..16cf9a283557 100644 --- a/fs/erofs/inode.c +++ b/fs/erofs/inode.c @@ -214,7 +214,7 @@ static int erofs_fill_symlink(struct inode *inode, void= *kaddr, =20 /* if it cannot be handled with fast symlink scheme */ if (vi->datalayout !=3D EROFS_INODE_FLAT_INLINE || - inode->i_size >=3D EROFS_BLKSIZ) { + inode->i_size >=3D EROFS_BLKSIZ || inode->i_size < 0) { inode->i_op =3D &erofs_symlink_iops; return 0; } --=20 2.35.1