nfc: nci: hci: Add check on skb nci_hci_send_cmd parameter

commit 5a9e0ff upstream.

skb can be NULL and may lead to a NULL pointer error.

Add a check condition before setting HCI rx buffer.

Signed-off-by: Christophe Ricard <[email protected]>
Signed-off-by: Samuel Ortiz <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: cricard13

net/nfc/nci/hci.c

@@ -233,7 +233,7 @@ int nci_hci_send_cmd(struct nci_dev *ndev, u8 gate, u8 cmd,
 	r = nci_request(ndev, nci_hci_send_data_req, (unsigned long)&data,
 			msecs_to_jiffies(NCI_DATA_TIMEOUT));
 
-	if (r == NCI_STATUS_OK)
+	if (r == NCI_STATUS_OK && skb)
 		*skb = conn_info->rx_skb;
 
 	return r;