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authorJan Kara <jack@suse.cz>2014-10-30 10:53:17 -0400
committerTheodore Ts'o <tytso@mit.edu>2014-10-30 10:53:17 -0400
commitae9e9c6aeea6f91ccb4fb369d7dd8f1a8b5f6a58 (patch)
tree7eba907e57a324fb69f42336fc4083421a6761a9 /fs/ext4
parent4f879ca687a5f2473b952937ce92c795a39019b4 (diff)
downloadop-kernel-dev-ae9e9c6aeea6f91ccb4fb369d7dd8f1a8b5f6a58.zip
op-kernel-dev-ae9e9c6aeea6f91ccb4fb369d7dd8f1a8b5f6a58.tar.gz
ext4: make ext4_ext_convert_to_initialized() return proper number of blocks
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>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/extents.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 37043d0..0b16fb4 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -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)
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