linux-kernel - [PATCH AUTOSEL 4.4 036/174] tty: ipwireless: Fix potential NULL pointer dereference

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Message-Id: <20200116174251.24326-36-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 12:40:33 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     YueHaibing <yuehaibing@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.4 036/174] tty: ipwireless: Fix potential NULL pointer dereference

From: YueHaibing <yuehaibing@...wei.com>

[ Upstream commit 7dd50e205b3348dc7784efbdf85723551de64a25 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 ad7031a4f3c4..454cdc6f2c05 100644
--- a/drivers/tty/ipwireless/hardware.c
+++ b/drivers/tty/ipwireless/hardware.c
@@ -1515,6 +1515,8 @@ 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);
 
 	/*
-- 
2.20.1