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authorXin Long <lucien.xin@gmail.com>2016-09-29 02:55:44 +0800
committerDavid S. Miller <davem@davemloft.net>2016-09-30 02:08:57 -0400
commit1cceda7849809a8857fd9f26efe8846506c710e1 (patch)
treefbdd3dec3706dabe2ef7d83e8c78a1f4e224ceb3 /net/sctp/socket.c
parent75b005b949d3dc93b526c3da0a750fd1fc9a703a (diff)
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sctp: fix the issue sctp_diag uses lock_sock in rcu_read_lock
When sctp dumps all the ep->assocs, it needs to lock_sock first, but now it locks sock in rcu_read_lock, and lock_sock may sleep, which would break rcu_read_lock. This patch is to get and hold one sock when traversing the list. After that and get out of rcu_read_lock, lock and dump it. Then it will traverse the list again to get the next one until all sctp socks are dumped. For sctp_diag_dump_one, it fixes this issue by holding asoc and moving cb() out of rcu_read_lock in sctp_transport_lookup_process. Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file") Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/socket.c')
-rw-r--r--net/sctp/socket.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9fc417a8b476..8ed2d99bde6d 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4469,17 +4469,21 @@ int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
const union sctp_addr *paddr, void *p)
{
struct sctp_transport *transport;
- int err = 0;
+ int err = -ENOENT;
rcu_read_lock();
transport = sctp_addrs_lookup_transport(net, laddr, paddr);
if (!transport || !sctp_transport_hold(transport))
goto out;
- err = cb(transport, p);
+
+ sctp_association_hold(transport->asoc);
sctp_transport_put(transport);
-out:
rcu_read_unlock();
+ err = cb(transport, p);
+ sctp_association_put(transport->asoc);
+
+out:
return err;
}
EXPORT_SYMBOL_GPL(sctp_transport_lookup_process);