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ipv6/flowlabel: simplify pid namespace lookup 

The code should be using the pid namespace from the procfs mount
instead of trying to look it up during open.

Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-04-11 10:01:30 +02:00
parent 93cb5a1f58
commit ad08978ab4
1 changed files with 6 additions and 23 deletions
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29
net/ipv6/ip6_flowlabel.c
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@ -754,6 +754,10 @@ static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
state->pid_ns = proc_pid_ns(file_inode(seq->file));
rcu_read_lock_bh();
return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}
@ -810,36 +814,15 @@ static const struct seq_operations ip6fl_seq_ops = {
static int ip6fl_seq_open(struct inode *inode, struct file *file)
{
struct seq_file *seq;
struct ip6fl_iter_state *state;
int err;
err = seq_open_net(inode, file, &ip6fl_seq_ops,
return seq_open_net(inode, file, &ip6fl_seq_ops,
sizeof(struct ip6fl_iter_state));
if (!err) {
seq = file->private_data;
state = ip6fl_seq_private(seq);
rcu_read_lock();
state->pid_ns = get_pid_ns(task_active_pid_ns(current));
rcu_read_unlock();
}
return err;
}
static int ip6fl_seq_release(struct inode *inode, struct file *file)
{
struct seq_file *seq = file->private_data;
struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
put_pid_ns(state->pid_ns);
return seq_release_net(inode, file);
}
static const struct file_operations ip6fl_seq_fops = {
.open = ip6fl_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = ip6fl_seq_release,
.release = seq_release_net,
};
static int __net_init ip6_flowlabel_proc_init(struct net *net)