tty: ipwireless: Fix potential NULL pointer dereference

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 <yuehaibing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/ipwireless/hardware.c b/drivers/tty/ipwireless/hardware.c
index b0baa4ce10f9897d5f2284c7aa6e50c6dd5bb7de..6bbf35682d5310cd1226410b4fdf91dfff1ae67a 100644 (file)
--- 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;
        ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);
 
        /*