ext4: check ext4_journal_get_write_access() errors

Check ext4_journal_get_write_access() errors.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: adilger@clusterfs.com
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mingming Cao <cmm@us.ibm.com>

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 6861194..63c33e0 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -57,10 +57,15 @@ static struct buffer_head *ext4_append(handle_t *handle,
 
        *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
 
-       if ((bh = ext4_bread(handle, inode, *block, 1, err))) {
+       bh = ext4_bread(handle, inode, *block, 1, err);
+       if (bh) {
                inode->i_size += inode->i_sb->s_blocksize;
                EXT4_I(inode)->i_disksize = inode->i_size;
-               ext4_journal_get_write_access(handle,bh);
+               *err = ext4_journal_get_write_access(handle, bh);
+               if (*err) {
+                       brelse(bh);
+                       bh = NULL;
+               }
        }
        return bh;
 }