tty: ipwireless: fix potential NULL pointer dereference

Add null check before dereferencing pointer ver_packet. Print error message and exit in case pointer ver_packet is NULL.

Addresses-Coverity-ID: 1362295

---
 drivers/tty/ipwireless/hardware.c | 7 +++++++
 1 file changed, 7 insertions(+)

index df0204b..20db99d 100644
@@ -1515,6 +1515,13 @@ static void ipw_send_setup_packet(struct ipw_hardware *hw)
 			sizeof(struct ipw_setup_get_version_query_packet),
 			ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
 			TL_SETUP_SIGNO_GET_VERSION_QRY);
+
+	if (!ver_packet) {
+		pr_err(IPWIRELESS_PCCARD_NAME
+		       ": Not enough memory to send packet\n");
+		return;
+	}
+
 	ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);
 
 	/*

2.5.0

And what next? The caller does not expect a failure and continues as if the packet has been set up and sent and waiting for a response. This will likely hang somewhere or just do nothing regarding sending/receiving user packets. Failures of alloc_ctrl_packet are handled elsewhere, even during the setup phase so this could be handled more gracefully.