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binderfs: rework binderfs_fill_super()

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Al pointed out that on binderfs_fill_super() error
deactivate_locked_super() will call binderfs_kill_super() so all of the
freeing and putting we currently do in binderfs_fill_super() is unnecessary
and buggy. Let's simply return errors and let binderfs_fill_super() take
care of cleaning up on error.

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christian Brauner <christian@brauner.io>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Brauner 2019-01-21 11:48:04 +01:00 committed by Greg Kroah-Hartman
parent e98e6fa186
commit 36975fc3e5
1 changed files with 11 additions and 30 deletions
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41
drivers/android/binderfs.c
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@ -461,12 +461,9 @@ static const struct inode_operations binderfs_dir_inode_operations = {
static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
{
int ret;
struct binderfs_info *info;
int ret = -ENOMEM;
struct inode *inode = NULL;
struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
get_ipc_ns(ipc_ns);
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
@ -488,15 +485,17 @@ static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_op = &binderfs_super_ops;
sb->s_time_gran = 1;
info = kzalloc(sizeof(struct binderfs_info), GFP_KERNEL);
if (!info)
goto err_without_dentry;
sb->s_fs_info = kzalloc(sizeof(struct binderfs_info), GFP_KERNEL);
if (!sb->s_fs_info)
return -ENOMEM;
info = sb->s_fs_info;
info->ipc_ns = get_ipc_ns(current->nsproxy->ipc_ns);
ret = binderfs_parse_mount_opts(data, &info->mount_opts);
if (ret)
goto err_without_dentry;
return ret;
info->ipc_ns = ipc_ns;
info->root_gid = make_kgid(sb->s_user_ns, 0);
if (!gid_valid(info->root_gid))
info->root_gid = GLOBAL_ROOT_GID;
@ -504,12 +503,9 @@ static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
if (!uid_valid(info->root_uid))
info->root_uid = GLOBAL_ROOT_UID;
sb->s_fs_info = info;
ret = -ENOMEM;
inode = new_inode(sb);
if (!inode)
goto err_without_dentry;
return -ENOMEM;
inode->i_ino = FIRST_INODE;
inode->i_fop = &simple_dir_operations;
@ -520,24 +516,9 @@ static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
sb->s_root = d_make_root(inode);
if (!sb->s_root)
goto err_without_dentry;
return -ENOMEM;
ret = binderfs_binder_ctl_create(sb);
if (ret)
goto err_with_dentry;
return 0;
err_with_dentry:
dput(sb->s_root);
sb->s_root = NULL;
err_without_dentry:
put_ipc_ns(ipc_ns);
iput(inode);
kfree(info);
return ret;
return binderfs_binder_ctl_create(sb);
}
static struct dentry *binderfs_mount(struct file_system_type *fs_type,