Ext3: add necessary check in case IO error happens

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>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index b176d4253544..6e4f8a529fbc 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 (unlikely(!bh)) {
+                        err = -ENOMEM;
+                        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);