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ext4: make ext4_ext_convert_to_initialized() return proper number of blocks

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ext4_ext_convert_to_initialized() can return more blocks than are
actually allocated from map->m_lblk in case where initial part of the
on-disk extent is zeroed out. Luckily this doesn't have serious
consequences because the caller currently uses the return value
only to unmap metadata buffers. Anyway this is a data
corruption/exposure problem waiting to happen so fix it.

Coverity-id: 1226848
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Jan Kara 2014-10-30 10:53:17 -04:00 committed by Theodore Ts'o
parent 4f879ca687
commit ae9e9c6aee
1 changed files with 4 additions and 5 deletions
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9
fs/ext4/extents.c
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@ -3603,11 +3603,10 @@ static int ext4_ext_convert_to_initialized(handle_t *handle,
}
}
allocated = ext4_split_extent(handle, inode, ppath,
&split_map, split_flag, flags);
if (allocated < 0)
err = allocated;
err = ext4_split_extent(handle, inode, ppath, &split_map, split_flag,
flags);
if (err > 0)
err = 0;
out:
/* If we have gotten a failure, don't zero out status tree */
if (!err)