linux-kernel - [PATCH v2 -next] tty: ipwireless: Fix potential NULL pointer dereference

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Message-ID: <20190130103051.5256-1-yuehaibing@huawei.com>
Date:   Wed, 30 Jan 2019 18:30:51 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <dsterba@...e.com>, <gregkh@...uxfoundation.org>, <jslaby@...e.com>
CC:     <linux-kernel@...r.kernel.org>, <jikos@...nel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH v2 -next] 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@...wei.com>
---
v2: fix return value
---
 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;
 	ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);
 
 	/*
-- 
2.7.0