linux-kernel - [PATCH] tty: ipwireless: fix possible NULL dereference

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Date:	Wed,  6 Apr 2016 12:25:39 +0100
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Jiri Kosina <jikos@...nel.org>, David Sterba <dsterba@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>
Cc:	linux-kernel@...r.kernel.org,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] tty: ipwireless: fix possible NULL dereference

The function alloc_ctrl_packet() can fail and return NULL. Incase it
fails print an error message and exit.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---
 drivers/tty/ipwireless/hardware.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/tty/ipwireless/hardware.c b/drivers/tty/ipwireless/hardware.c
index ad7031a..df0204b 100644
--- a/drivers/tty/ipwireless/hardware.c
+++ b/drivers/tty/ipwireless/hardware.c
@@ -1572,6 +1572,11 @@ static void handle_received_SETUP_packet(struct ipw_hardware *hw,
 					sizeof(struct ipw_setup_reboot_msg_ack),
 					ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
 					TL_SETUP_SIGNO_REBOOT_MSG_ACK);
+			if (!packet) {
+				pr_err(IPWIRELESS_PCCARD_NAME
+				       ": Not enough memory to send reboot packet");
+				break;
+			}
 			packet->header.length =
 				sizeof(struct TlSetupRebootMsgAck);
 			send_packet(hw, PRIO_SETUP, &packet->header);
-- 
2.1.4