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btrfs: hold a ref on the root in btrfs_search_path_in_tree 

We look up an arbitrary fs root, we need to hold a ref on it while we're
doing our search.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-01-24 09:32:34 -05:00 committed by David Sterba
parent 3ca35e839e
commit 88234012be
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/ioctl.c
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@ -2328,6 +2328,12 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
root = btrfs_get_fs_root(info, &key, true);
if (IS_ERR(root)) {
ret = PTR_ERR(root);
root = NULL;
goto out;
}
if (!btrfs_grab_fs_root(root)) {
ret = -ENOENT;
root = NULL;
goto out;
}
@ -2378,6 +2384,7 @@ static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
name[total_len] = '\0';
ret = 0;
out:
btrfs_put_fs_root(root);
btrfs_free_path(path);
return ret;
}