[CCID]: Check if ccid is NULL in the hc_[tr]x_exit functions

For consistency with ccid_exit and to fix a bug when
IP_DCCP_UNLOAD_HACK is enabled as the control sock is not associated
to any CCID.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h
index 21e55142dcd3..c37eeeaf5c6e 100644
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -110,14 +110,14 @@ static inline int ccid_hc_tx_init(struct ccid *ccid, struct sock *sk)
 
 static inline void ccid_hc_rx_exit(struct ccid *ccid, struct sock *sk)
 {
-        if (ccid->ccid_hc_rx_exit != NULL &&
+        if (ccid != NULL && ccid->ccid_hc_rx_exit != NULL &&
             dccp_sk(sk)->dccps_hc_rx_ccid_private != NULL)
                 ccid->ccid_hc_rx_exit(sk);
 }
 
 static inline void ccid_hc_tx_exit(struct ccid *ccid, struct sock *sk)
 {
-        if (ccid->ccid_hc_tx_exit != NULL &&
+        if (ccid != NULL && ccid->ccid_hc_tx_exit != NULL &&
             dccp_sk(sk)->dccps_hc_tx_ccid_private != NULL)
                 ccid->ccid_hc_tx_exit(sk);
 }