caif: added check for potential null return

Add check on NULL return from caif_get().

Signed-off-by: Kim Lilliestierna <Kim.xx.Lilliestierna@stericsson.com>
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericssion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c
index e601da7ca2ff..551d2fd6a80d 100644
--- a/net/caif/caif_dev.c
+++ b/net/caif/caif_dev.c
@@ -128,6 +128,11 @@ void caif_flow_cb(struct sk_buff *skb)
 
         rcu_read_lock();
         caifd = caif_get(skb->dev);
+
+        WARN_ON(caifd == NULL);
+        if (caifd == NULL)
+                return;
+
         caifd_hold(caifd);
         rcu_read_unlock();