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| author | Su Yue <suy.fnst@cn.fujitsu.com> | 2017-06-06 17:57:02 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2017-06-21 19:16:04 +0200 |
| commit | 26a836cec2ea38329ddf3f049c78e9b94e500670 (patch) | |
| tree | 80229894853e88e862f74defffa9bf2a2ed72f19 /fs/btrfs/dir-item.c | |
| parent | e79a33270d05f711e985b9524a392fd45ad3e93f (diff) | |
| download | linux-26a836cec2ea38329ddf3f049c78e9b94e500670.tar.bz2 | |
btrfs: Check name_len on add_inode_ref call path
replay_one_buffer first reads buffers and dispatches items accroding to
the item type.
In this patch, add_inode_ref handles inode_ref and inode_extref.
Then add_inode_ref calls ref_get_fields and extref_get_fields to read
ref/extref name for the first time.
So checking name_len before reading those two is fine.
add_inode_ref also calls inode_in_dir to match ref/extref in parent_dir.
The call graph includes btrfs_match_dir_item_name to read dir_item name
in the parent dir.
Checking first dir_item is not enough. Change it to verify every
dir_item while doing matches.
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/dir-item.c')
| -rw-r--r-- | fs/btrfs/dir-item.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index d9c4a3dd071e..2b00dd746118 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -395,8 +395,6 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, leaf = path->nodes[0]; dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item); - if (verify_dir_item(fs_info, leaf, path->slots[0], dir_item)) - return NULL; total_len = btrfs_item_size_nr(leaf, path->slots[0]); while (cur < total_len) { @@ -405,6 +403,8 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, btrfs_dir_data_len(leaf, dir_item); name_ptr = (unsigned long)(dir_item + 1); + if (verify_dir_item(fs_info, leaf, path->slots[0], dir_item)) + return NULL; if (btrfs_dir_name_len(leaf, dir_item) == name_len && memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) return dir_item; |