[PATCH 2/2] Ext3: add necessary check in case IO error happens

[shilong wang <wangshilong1991@gmail.com>]

From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>

As we know IO ERROR may happen when the function 'sb_getblk' is
called. Add necessary check for it.

The patch also fix a coding style problem.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
---
 fs/ext3/inode.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index ff574b4..59b6178 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -676,6 +676,10 @@ static int ext3_alloc_branch(handle_t *handle,
struct inode *inode,
 		 * parent to disk.
 		 */
 		bh = sb_getblk(inode->i_sb, new_blocks[n-1]);
+		if (!bh) {
+			err = -EIO;
+			goto failed;
+		}
 		branch[n].bh = bh;
 		lock_buffer(bh);
 		BUFFER_TRACE(bh, "call get_create_access");
@@ -717,7 +721,7 @@ failed:
 		BUFFER_TRACE(branch[i].bh, "call journal_forget");
 		ext3_journal_forget(handle, branch[i].bh);
 	}
-	for (i = 0; i <indirect_blks; i++)
+	for (i = 0; i < indirect_blks; i++)
 		ext3_free_blocks(handle, inode, new_blocks[i], 1);

 	ext3_free_blocks(handle, inode, new_blocks[i], num);
-- 
1.7.7.6