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btrfs: Introduce btrfs_is_name_len_valid to avoid reading beyond boundary

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Introduce function btrfs_is_name_len_valid.

The function compares parameter @name_len with item boundary then
returns true if name_len is valid.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ s/btrfs_leaf_data/BTRFS_LEAF_DATA_OFFSET/ ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue
2017-06-06 17:57:00 +08:00
committed by David Sterba
parent 66b4993e95
commit 19c6dcbfa7
2 changed files with 74 additions and 0 deletions
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fs/btrfs/ctree.h
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@@ -3042,6 +3042,8 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
struct btrfs_path *path,
const char *name,
int name_len);
bool btrfs_is_name_len_valid(struct extent_buffer *leaf, int slot,
unsigned long start, u16 name_len);
/* orphan.c */
int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,