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btrfs: Check name_len before read in iterate_dir_item 

Since iterate_dir_item checks name_len in its own way,
so use btrfs_is_name_len_valid not 'verify_dir_item' to make more strict
name_len check.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ switched ENAMETOOLONG to EIO ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue 2017-06-06 17:57:05 +08:00 committed by David Sterba
parent 3c1d418448
commit 59b0a7f2c7
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/send.c
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@ -1069,6 +1069,12 @@ static int iterate_dir_item(struct btrfs_root *root, struct btrfs_path *path,
}
}
ret = btrfs_is_name_len_valid(eb, path->slots[0],
(unsigned long)(di + 1), name_len + data_len);
if (!ret) {
ret = -EIO;
goto out;
}
if (name_len + data_len > buf_len) {
buf_len = name_len + data_len;
if (is_vmalloc_addr(buf)) {