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btrfs: Check name_len before reading btrfs_get_name

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In btrfs_get_name, there's btrfs_search_slot and reads name from
inode_ref/root_ref.

Call btrfs_is_name_len_valid in btrfs_get_name.

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>
This commit is contained in:
Su Yue 2017-06-06 17:57:06 +08:00 committed by David Sterba
parent 59b0a7f2c7
commit 488d7c4566
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/export.c
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@ -282,6 +282,11 @@ static int btrfs_get_name(struct dentry *parent, char *name,
name_len = btrfs_inode_ref_name_len(leaf, iref);
}
ret = btrfs_is_name_len_valid(leaf, path->slots[0], name_ptr, name_len);
if (!ret) {
btrfs_free_path(path);
return -EIO;
}
read_extent_buffer(leaf, name, name_ptr, name_len);
btrfs_free_path(path);