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authorXin Long <lucien.xin@gmail.com>2021-12-31 18:37:37 -0500
committerDavid S. Miller <davem@davemloft.net>2022-01-02 12:46:41 +0000
commitf9d31c4cf4c11ff10317f038b9c6f7c3bda6cdd4 (patch)
treeb9773cb8cf506bcab4f94014afbb12becbe18e76 /net/sctp
parent5b40d10b604280a5bdf355b9d47ed238c92233dd (diff)
sctp: hold endpoint before calling cb in sctp_transport_lookup_process
The same fix in commit 5ec7d18d1813 ("sctp: use call_rcu to free endpoint") is also needed for dumping one asoc and sock after the lookup. Fixes: 86fdb3448cc1 ("sctp: ensure ep is not destroyed before doing the dump") Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/diag.c46
-rw-r--r--net/sctp/socket.c22
2 files changed, 36 insertions, 32 deletions
diff --git a/net/sctp/diag.c b/net/sctp/diag.c
index a7d623171501..034e2c74497d 100644
--- a/net/sctp/diag.c
+++ b/net/sctp/diag.c
@@ -245,48 +245,44 @@ static size_t inet_assoc_attr_size(struct sctp_association *asoc)
+ 64;
}
-static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
+static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
{
struct sctp_association *assoc = tsp->asoc;
- struct sock *sk = tsp->asoc->base.sk;
struct sctp_comm_param *commp = p;
- struct sk_buff *in_skb = commp->skb;
+ struct sock *sk = ep->base.sk;
const struct inet_diag_req_v2 *req = commp->r;
- const struct nlmsghdr *nlh = commp->nlh;
- struct net *net = sock_net(in_skb->sk);
+ struct sk_buff *skb = commp->skb;
struct sk_buff *rep;
int err;
err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
if (err)
- goto out;
+ return err;
- err = -ENOMEM;
rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
if (!rep)
- goto out;
+ return -ENOMEM;
lock_sock(sk);
- if (sk != assoc->base.sk) {
- release_sock(sk);
- sk = assoc->base.sk;
- lock_sock(sk);
+ if (ep != assoc->ep) {
+ err = -EAGAIN;
+ goto out;
}
- err = inet_sctp_diag_fill(sk, assoc, rep, req,
- sk_user_ns(NETLINK_CB(in_skb).sk),
- NETLINK_CB(in_skb).portid,
- nlh->nlmsg_seq, 0, nlh,
- commp->net_admin);
- release_sock(sk);
+
+ err = inet_sctp_diag_fill(sk, assoc, rep, req, sk_user_ns(NETLINK_CB(skb).sk),
+ NETLINK_CB(skb).portid, commp->nlh->nlmsg_seq, 0,
+ commp->nlh, commp->net_admin);
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
- kfree_skb(rep);
goto out;
}
+ release_sock(sk);
- err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
+ return nlmsg_unicast(sock_net(skb->sk)->diag_nlsk, rep, NETLINK_CB(skb).portid);
out:
+ release_sock(sk);
+ kfree_skb(rep);
return err;
}
@@ -429,15 +425,15 @@ static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
static int sctp_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
- struct sk_buff *in_skb = cb->skb;
- struct net *net = sock_net(in_skb->sk);
+ struct sk_buff *skb = cb->skb;
+ struct net *net = sock_net(skb->sk);
const struct nlmsghdr *nlh = cb->nlh;
union sctp_addr laddr, paddr;
struct sctp_comm_param commp = {
- .skb = in_skb,
+ .skb = skb,
.r = req,
.nlh = nlh,
- .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
+ .net_admin = netlink_net_capable(skb, CAP_NET_ADMIN),
};
if (req->sdiag_family == AF_INET) {
@@ -460,7 +456,7 @@ static int sctp_diag_dump_one(struct netlink_callback *cb,
paddr.v6.sin6_family = AF_INET6;
}
- return sctp_transport_lookup_process(sctp_tsp_dump_one,
+ return sctp_transport_lookup_process(sctp_sock_dump_one,
net, &laddr, &paddr, &commp);
}
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index ad5028a07b18..da08671a3f80 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5317,23 +5317,31 @@ int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *),
}
EXPORT_SYMBOL_GPL(sctp_for_each_endpoint);
-int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
- struct net *net,
+int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
const union sctp_addr *laddr,
const union sctp_addr *paddr, void *p)
{
struct sctp_transport *transport;
- int err;
+ struct sctp_endpoint *ep;
+ int err = -ENOENT;
rcu_read_lock();
transport = sctp_addrs_lookup_transport(net, laddr, paddr);
+ if (!transport) {
+ rcu_read_unlock();
+ return err;
+ }
+ ep = transport->asoc->ep;
+ if (!sctp_endpoint_hold(ep)) { /* asoc can be peeled off */
+ sctp_transport_put(transport);
+ rcu_read_unlock();
+ return err;
+ }
rcu_read_unlock();
- if (!transport)
- return -ENOENT;
- err = cb(transport, p);
+ err = cb(ep, transport, p);
+ sctp_endpoint_put(ep);
sctp_transport_put(transport);
-
return err;
}
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);