From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailout4.samsung.com ([203.254.224.34]:57143 "EHLO mailout4.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752071AbcAKG0D (ORCPT ); Mon, 11 Jan 2016 01:26:03 -0500 Received: from epcpsbgm1new.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout4.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0O0R01L40Z7DWO30@mailout4.samsung.com> for linux-fsdevel@vger.kernel.org; Mon, 11 Jan 2016 15:26:01 +0900 (KST) Received: from lifan ([109.123.105.144]) by mmp1.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTPA id <0O0R00K7SZ6GVDC0@mmp1.samsung.com> for linux-fsdevel@vger.kernel.org; Mon, 11 Jan 2016 15:26:00 +0900 (KST) From: Fan Li To: linux-fsdevel@vger.kernel.org Subject: [PATCH 1/3] fs: update len properly when search range exceeds isize Date: Mon, 11 Jan 2016 14:25:26 +0800 Message-id: <001301d14c38$ef2e17f0$cd8a47d0$@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=windows-1252 Content-transfer-encoding: 7bit Content-language: en-us Sender: linux-fsdevel-owner@vger.kernel.org List-ID: __generic_block_fiemap() looks up extents within isize, so original function truncate len to isize if len >= isize, but when start > 0, start + len would still be greater than isize. Update len properly in this patch. Signed-off-by: Fan Li --- fs/ioctl.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/ioctl.c b/fs/ioctl.c index 41c352e..13a3e96 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -268,9 +268,12 @@ int __generic_block_fiemap(struct inode *inode, * since we expect isize to not change at all through the duration of * this call. */ - if (len >= isize) { + if (start >= isize) + return 0; + + if (start + len > isize) { whole_file = true; - len = isize; + len = isize - start; } /* -- 1.7.9.5