Bluetooth: 6lowpan: Make sure skb exists before accessing it

We need to make sure that the saved skb exists when
resuming or suspending a CoC channel. This can happen if
initial credits is 0 when channel is connected.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 0920cb6ed572..5d3e6202da3d 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -950,6 +950,9 @@ static void chan_suspend_cb(struct l2cap_chan *chan)
 
         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
 
+        if (!skb)
+                return;
+
         lowpan_cb(skb)->status = -EAGAIN;
 }
 
@@ -959,6 +962,9 @@ static void chan_resume_cb(struct l2cap_chan *chan)
 
         BT_DBG("chan %p conn %p skb %p", chan, chan->conn, skb);
 
+        if (!skb)
+                return;
+
         lowpan_cb(skb)->status = 0;
 }