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sctp: fix some rhashtable functions using in sctp proc/diag

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When rhashtable_walk_init return err, no release function should be
called, and when rhashtable_walk_start return err, we should only invoke
rhashtable_walk_exit to release the source.

But now when sctp_transport_walk_start return err, we just call
rhashtable_walk_stop/exit, and never care about if rhashtable_walk_init
or start return err, which is so bad.

We will fix it by calling rhashtable_walk_exit if rhashtable_walk_start
return err in sctp_transport_walk_start, and if sctp_transport_walk_start
return err, we do not need to call sctp_transport_walk_stop any more.

For sctp proc, we will use 'iter->start_fail' to decide if we will call
rhashtable_walk_stop/exit.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2016-04-14 15:35:35 +08:00
committed by David S. Miller
parent b5e2f4e699
commit 53fa10369c
2 changed files with 16 additions and 6 deletions
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7
net/sctp/proc.c
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@@ -280,6 +280,7 @@ void sctp_eps_proc_exit(struct net *net)
struct sctp_ht_iter {
struct seq_net_private p;
struct rhashtable_iter hti;
int start_fail;
};
static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos)
@@ -287,8 +288,10 @@ static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos)
struct sctp_ht_iter *iter = seq->private;
int err = sctp_transport_walk_start(&iter->hti);
if (err)
if (err) {
iter->start_fail = 1;
return ERR_PTR(err);
}
return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos);
}
@@ -297,6 +300,8 @@ static void sctp_transport_seq_stop(struct seq_file *seq, void *v)
{
struct sctp_ht_iter *iter = seq->private;
if (iter->start_fail)
return;
sctp_transport_walk_stop(&iter->hti);
}