Return-Path: linux-nfs-owner@vger.kernel.org Received: from cn.fujitsu.com ([222.73.24.84]:23893 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754315Ab3CLGJB (ORCPT ); Tue, 12 Mar 2013 02:09:01 -0400 Message-ID: <513EC692.4090907@cn.fujitsu.com> Date: Tue, 12 Mar 2013 14:09:22 +0800 From: fanchaoting MIME-Version: 1.0 To: "Myklebust, Trond" CC: "linux-nfs@vger.kernel.org" Subject: [PATCH] pnfs-block: may be return NULL when find a extent Content-Type: text/plain; charset=ISO-2022-JP Sender: linux-nfs-owner@vger.kernel.org List-ID: maybe return NULL when find a extent, if we use it later, it will cause oops. Signed-off-by: fanchaoting --- fs/nfs/blocklayout/extents.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c index 9c3e117..131ea59 100644 --- a/fs/nfs/blocklayout/extents.c +++ b/fs/nfs/blocklayout/extents.c @@ -762,6 +762,11 @@ set_to_rw(struct pnfs_block_layout *bl, u64 offset, u64 length) spin_lock(&bl->bl_ext_lock); be = bl_find_get_extent_locked(bl, offset); + if (!be) { + spin_unlock(&bl->bl_ext_lock); + goto out_nosplit; + } + rv = be->be_f_offset + be->be_length; if (be->be_state != PNFS_BLOCK_INVALID_DATA) { spin_unlock(&bl->bl_ext_lock); -- 1.7.1