[PATCH -next] tty: ipwireless: Fix potential NULL pointer dereference

[YueHaibing]

There is a potential NULL pointer dereference in case
alloc_ctrl_packet() fails and returns NULL.

Fixes: 099dc4fb6265 ("ipwireless: driver for PC Card 3G/UMTS modem")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/tty/ipwireless/hardware.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/ipwireless/hardware.c 
b/drivers/tty/ipwireless/hardware.c
index b0baa4c..1e21ae3 100644
--- a/drivers/tty/ipwireless/hardware.c
+++ b/drivers/tty/ipwireless/hardware.c
@@ -1516,6 +1516,8 @@ 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)
+               return -ENOMEM;
        ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);
 
        /*
-- 
2.7.0