[PATCH net] sctp: ensure ep is not destroyed before doing the dump

[Xin Long]

Now before dumping a sock in sctp_diag, it only holds the sock while
the ep may be already destroyed. It can cause a use-after-free panic
when accessing ep->asocs.

This patch is to set sctp_sk(sk)->ep NULL in sctp_endpoint_destroy,
and check if this ep is already destroyed before dumping this ep.

Suggested-by: Marcelo Ricardo Leitner <marcelo.leit...@gmail.com>
Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/sctp/endpointola.c | 1 +
 net/sctp/sctp_diag.c   | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index 8c58923..3dcd0ec 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -275,6 +275,7 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
                if (sctp_sk(sk)->bind_hash)
                        sctp_put_port(sk);
 
+               sctp_sk(sk)->ep = NULL;
                sock_put(sk);
        }
 
diff --git a/net/sctp/sctp_diag.c b/net/sctp/sctp_diag.c
index 048954e..9a64721 100644
--- a/net/sctp/sctp_diag.c
+++ b/net/sctp/sctp_diag.c
@@ -278,7 +278,6 @@ static int sctp_tsp_dump_one(struct sctp_transport *tsp, 
void *p)
 
 static int sctp_sock_dump(struct sock *sk, void *p)
 {
-       struct sctp_endpoint *ep = sctp_sk(sk)->ep;
        struct sctp_comm_param *commp = p;
        struct sk_buff *skb = commp->skb;
        struct netlink_callback *cb = commp->cb;
@@ -287,7 +286,9 @@ static int sctp_sock_dump(struct sock *sk, void *p)
        int err = 0;
 
        lock_sock(sk);
-       list_for_each_entry(assoc, &ep->asocs, asocs) {
+       if (!sctp_sk(sk)->ep)
+               goto release;
+       list_for_each_entry(assoc, &sctp_sk(sk)->ep->asocs, asocs) {
                if (cb->args[4] < cb->args[1])
                        goto next;
 
-- 
2.1.0