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sctp: sctp_transport_lookup_process should rcu_read_unlock when transport is null

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[ Upstream commit 08abb79542 ]

Prior to this patch, sctp_transport_lookup_process didn't rcu_read_unlock
when it failed to find a transport by sctp_addrs_lookup_transport.

This patch is to fix it by moving up rcu_read_unlock right before checking
transport and also to remove the out path.

Fixes: 1cceda7849 ("sctp: fix the issue sctp_diag uses lock_sock in rcu_read_lock")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xin Long
2016-12-15 23:05:52 +08:00
committed by Greg Kroah-Hartman
parent 8b8fbe5c25
commit ed3cc329c7
1 changed files with 3 additions and 2 deletions
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5
net/sctp/socket.c
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@@ -4479,9 +4479,10 @@ int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
rcu_read_lock();
transport = sctp_addrs_lookup_transport(net, laddr, paddr);
if (!transport || !sctp_transport_hold(transport))
if (!transport || !sctp_transport_hold(transport)) {
rcu_read_unlock();
goto out;
}
rcu_read_unlock();
err = cb(transport, p);
sctp_transport_put(transport);