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btrfs: Check name_len before in btrfs_del_root_ref

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btrfs_del_root_ref calls btrfs_search_slot and reads name from root_ref.
Call btrfs_is_name_len_valid before memcmp.

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 17:57:07 +08:00 committed by David Sterba
parent 488d7c4566
commit 64c7b01446
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/root-tree.c
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@ -390,6 +390,13 @@ again:
WARN_ON(btrfs_root_ref_dirid(leaf, ref) != dirid);
WARN_ON(btrfs_root_ref_name_len(leaf, ref) != name_len);
ptr = (unsigned long)(ref + 1);
ret = btrfs_is_name_len_valid(leaf, path->slots[0], ptr,
name_len);
if (!ret) {
err = -EIO;
goto out;
}
WARN_ON(memcmp_extent_buffer(leaf, name, ptr, name_len));
*sequence = btrfs_root_ref_sequence(leaf, ref);